Alan Dean

Alan Deanhttp://dotnetjunkies.com/WebLog/alan.dean/default.aspxThe view from a product developeren-GBCommunityServer 1.0 (Build: 1.0.1.50214)[How To] Add a search engine toolbar to VS.NEThttp://dotnetjunkies.com/WebLog/alan.dean/archive/2005/05/20/85618.aspxFri, 20 May 2005 15:13:00 GMT58df7014-fd75-437c-9641-150997716d1c:85618alan.dean2http://dotnetjunkies.com/WebLog/alan.dean/comments/85618.aspxhttp://dotnetjunkies.com/WebLog/alan.dean/commentrss.aspx?PostID=85618<p>This article has moved to <a href="http://thoughtpad.net/alan-dean/vs-search-toolbar.html" title="Visual Studio Search Toolbar">http://thoughtpad.net/alan-dean/vs-search-toolbar.html</a></p><img src="http://dotnetjunkies.com/WebLog/aggbug.aspx?PostID=85618" width="1" height="1">[How To] Use XML Documentation (Part 3: Complex tables)http://dotnetjunkies.com/WebLog/alan.dean/archive/2005/05/03/72705.aspxTue, 03 May 2005 14:29:00 GMT58df7014-fd75-437c-9641-150997716d1c:72705alan.dean8http://dotnetjunkies.com/WebLog/alan.dean/comments/72705.aspxhttp://dotnetjunkies.com/WebLog/alan.dean/commentrss.aspx?PostID=72705<p>This article has moved to <a href="http://thoughtpad.net/alan-dean/cs-xml-documentation.html" title="C# XML Documentation">http://thoughtpad.net/alan-dean/cs-xml-documentation.html</a></p><img src="http://dotnetjunkies.com/WebLog/aggbug.aspx?PostID=72705" width="1" height="1">[How To] Use XML Documentation (Part 2: The Detail)http://dotnetjunkies.com/WebLog/alan.dean/archive/2005/05/03/72701.aspxTue, 03 May 2005 13:38:00 GMT58df7014-fd75-437c-9641-150997716d1c:72701alan.dean13http://dotnetjunkies.com/WebLog/alan.dean/comments/72701.aspxhttp://dotnetjunkies.com/WebLog/alan.dean/commentrss.aspx?PostID=72701<p>This article has moved to <a href="http://thoughtpad.net/alan-dean/cs-xml-documentation.html" title="C# XML Documentation">http://thoughtpad.net/alan-dean/cs-xml-documentation.html</a></p><img src="http://dotnetjunkies.com/WebLog/aggbug.aspx?PostID=72701" width="1" height="1">[How To] Use XML Documentation (Part 1: The Overview)http://dotnetjunkies.com/WebLog/alan.dean/archive/2005/05/03/72697.aspxTue, 03 May 2005 13:05:00 GMT58df7014-fd75-437c-9641-150997716d1c:72697alan.dean8http://dotnetjunkies.com/WebLog/alan.dean/comments/72697.aspxhttp://dotnetjunkies.com/WebLog/alan.dean/commentrss.aspx?PostID=72697<p>This article has moved to <a href="http://thoughtpad.net/alan-dean/cs-xml-documentation.html" title="C# XML Documentation">http://thoughtpad.net/alan-dean/cs-xml-documentation.html</a></p><img src="http://dotnetjunkies.com/WebLog/aggbug.aspx?PostID=72697" width="1" height="1">[Secure Development] Using the Credential Management API to store user passwordshttp://dotnetjunkies.com/WebLog/alan.dean/archive/2005/04/27/71592.aspxWed, 27 Apr 2005 16:03:00 GMT58df7014-fd75-437c-9641-150997716d1c:71592alan.dean1http://dotnetjunkies.com/WebLog/alan.dean/comments/71592.aspxhttp://dotnetjunkies.com/WebLog/alan.dean/commentrss.aspx?PostID=71592<P><FONT face=Arial>Following secure development best practice, an application should obtain and store user credentials securely. </FONT></P> <P><FONT face=Arial>Microsoft has provided a means to accomplish this on the desktop: the unmanaged Credential Management API, which exposes the capability to provide a standard login experience for the user which is also secure. There are a number of benefits to utilising this: <UL> <LI>The code is maintained by Microsoft. I put this in the first because I think it is an important advantage. <LI>The user experience is consistent. <LI>The user credentials can be shared easily across applications. <LI>It's secure. It's well-tested as being secure. If a security flaw is discovered, you can be sure that Microsoft will fix it.</LI></UL></FONT> <P></P> <P><FONT face=Arial>This is documented on MSDN: <A href="http://msdn.microsoft.com/library/default.asp?url=/library/en-us/secauthn/security/credentials_management.asp">Credentials Management</A> > <A href="http://msdn.microsoft.com/library/default.asp?url=/library/en-us/secauthn/security/authentication_reference.asp">Authentication Reference</A></FONT></P> <P><FONT face=Arial>While researching this, I discovered some excellent resources:</FONT></P> <P><FONT face=Arial> <UL> <LI>[MSDN Technical Article] <A href="http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dnnetsec/html/dpapiusercredentials.asp">"Using Credential Management in Windows XP and Windows Server 2003"</A> <LI>[MSDN Magazine] <A href="http://msdn.microsoft.com/msdnmag/issues/04/11/AppLockdown/default.aspx">"App Lockdown: Defend Your Apps and Critical User Info with Defensive Coding Techniques"</A> by <A href="http://weblogs.asp.net/kennykerr">Kenny Kerr</A> who has also published a <A href="http://weblogs.asp.net/kennykerr/archive/2004/09/25/234250.aspx">Supplement</A> to the article that deals with web applications. <LI>[Blog] <A href="http://sqljunkies.com/WebLog/donkiely/">Don Kiely</A> posted a simple VB.NET sample on <A href="http://sqljunkies.com/WebLog/donkiely/archive/2005/01/04/5942.aspx">"Don't Reinvent the Wheel: Use CredUIPromptForCredentials as a Login Window"</A>. <LI>[Wiki] <A href="http://pluralsight.com/wiki/default.aspx/Keith.GuideBook/HomePage.html">The .NET Developer's Guide to Windows Security</A> has an item <A href="http://pluralsight.com/wiki/default.aspx/Keith.GuideBook/HowToPromptForAPassword.html?diff=y">"How To Prompt For A Password"</A>.</LI></UL></FONT> <P></P> <P><FONT face=Arial>What I didn't find was a comprehensive code sample of a Generic dialog implementation, so I decided to put one together.</FONT></P> <P><FONT face=Arial>Before going any further, I should highlight that the Credential Management API is only available on Windows XP / Windows Server 2003 onwards.</FONT></P><FONT face=Arial> <P><FONT face=Arial>I don't usually post such a large slice of code as this but I felt that it would be the clearest way to describe the class and also has the benefit that readers can cut & paste the entire sample easily. So here is my entire credential wrapper code:</FONT> </FONT></P> <P><FONT face="Courier New" color=#000000><FONT color=#0000ff>using</FONT> System;<BR><FONT color=#0000ff>using</FONT> System.Drawing;<BR><FONT color=#0000ff>using</FONT> System.Runtime.InteropServices;<BR><FONT color=#0000ff>using</FONT> System.Reflection;<BR><FONT color=#0000ff>using</FONT> System.Text;<BR><FONT color=#0000ff>using</FONT> System.Threading;<BR><FONT color=#0000ff>using</FONT> System.Windows.Forms;<BR><BR><FONT color=#0000ff>namespace</FONT> SecureCredentialsLibrary<BR>{<BR>    <FONT color=#008000>/// <FONT color=#808080><summary></FONT>Encapsulates dialog functionality from the Credential Management API.</FONT><FONT color=#808080></summary><BR></FONT>    <FONT color=#0000ff>public sealed class</FONT> CredentialsDialog<BR>    {<BR>        <FONT color=#008000>/// <FONT color=#808080><summary></FONT>The only valid bitmap height (in pixels) of a user-defined banner.</FONT><FONT color=#808080></summary><BR></FONT>        <FONT color=#0000ff>private const int</FONT> ValidBannerHeight = 60;<BR>        <FONT color=#008000>/// <FONT color=#808080><summary></FONT>The only valid bitmap width (in pixels) of a user-defined banner.</FONT><FONT color=#808080></summary><BR></FONT>        <FONT color=#0000ff>private const int</FONT> ValidBannerWidth = 320;<BR>        <BR>        <FONT color=#008000>/// <FONT color=#808080><summary></FONT>Initializes a new instance of the <FONT color=#808080><see cref="T:SecureCredentialsLibrary.CredentialsDialog"/></FONT> class<BR>        /// with the specified target.<FONT color=#808080></summary><BR></FONT>        /// <FONT color=#808080><param name="target"></FONT>The name of the target for the credentials, typically a server name.</FONT><FONT color=#808080></param><BR></FONT>        <FONT color=#0000ff>public</FONT> CredentialsDialog(<FONT color=#0000ff>string</FONT> target) : <FONT color=#0000ff>this</FONT>(target, <FONT color=#0000ff>null</FONT>)<BR>        { }<BR>        <FONT color=#008000>/// <FONT color=#808080><summary></FONT>Initializes a new instance of the <FONT color=#808080><see cref="T:SecureCredentialsLibrary.CredentialsDialog"/></FONT> class<BR>        /// with the specified target and caption.<FONT color=#808080></summary><BR></FONT>        /// <FONT color=#808080><param name="target"></FONT>The name of the target for the credentials, typically a server name.<FONT color=#808080></param><BR></FONT>        /// <FONT color=#808080><param name="caption"></FONT>The caption of the dialog (null will cause a system default title to be used).</FONT><FONT color=#808080></param><BR></FONT>        <FONT color=#0000ff>public</FONT> CredentialsDialog(<FONT color=#0000ff>string</FONT> target, <FONT color=#0000ff>string</FONT> caption) : <FONT color=#0000ff>this</FONT>(target, caption, <FONT color=#0000ff>null</FONT>)<BR>        { }<BR>        <FONT color=#008000>/// <FONT color=#808080><summary></FONT>Initializes a new instance of the <FONT color=#808080><see cref="T:SecureCredentialsLibrary.CredentialsDialog"/></FONT> class<BR>        /// with the specified target, caption and message.<FONT color=#808080></summary><BR></FONT>        /// <FONT color=#808080><param name="target"></FONT>The name of the target for the credentials, typically a server name.<FONT color=#808080></param><BR></FONT>        /// <FONT color=#808080><param name="caption"></FONT>The caption of the dialog (null will cause a system default title to be used).<FONT color=#808080></param><BR></FONT>        /// <FONT color=#808080><param name="message"></FONT>The message of the dialog (null will cause a system default message to be used).</FONT><FONT color=#808080></param><BR></FONT>        <FONT color=#0000ff>public</FONT> CredentialsDialog(<FONT color=#0000ff>string</FONT> target, <FONT color=#0000ff>string</FONT> caption, <FONT color=#0000ff>string</FONT> message) : <FONT color=#0000ff>this</FONT>(target, caption, message, <FONT color=#0000ff>null</FONT>)<BR>        { }<BR>        <FONT color=#008000>/// <FONT color=#808080><summary></FONT>Initializes a new instance of the <FONT color=#808080><see cref="T:SecureCredentialsLibrary.CredentialsDialog"/></FONT> class<BR>        /// with the specified target, caption, message and banner.<FONT color=#808080></summary><BR></FONT>        /// <FONT color=#808080><param name="target"></FONT>The name of the target for the credentials, typically a server name.<FONT color=#808080></param><BR></FONT>        /// <FONT color=#808080><param name="caption"></FONT>The caption of the dialog (null will cause a system default title to be used).<FONT color=#808080></param><BR></FONT>        /// <FONT color=#808080><param name="message"></FONT>The message of the dialog (null will cause a system default message to be used).<FONT color=#808080></param><BR></FONT>        /// <FONT color=#808080><param name="banner"></FONT>The image to display on the dialog (null will cause a system default image to be used).</FONT><FONT color=#808080></param><BR></FONT>        <FONT color=#0000ff>public</FONT> CredentialsDialog(<FONT color=#0000ff>string</FONT> target, <FONT color=#0000ff>string</FONT> caption, <FONT color=#0000ff>string</FONT> message, Image banner)<BR>        {<BR>            <FONT color=#0000ff>this</FONT>.Target = target;<BR>            <FONT color=#0000ff>this</FONT>.Caption = caption;<BR>            <FONT color=#0000ff>this</FONT>.Message = message;<BR>            <FONT color=#0000ff>this</FONT>.Banner = banner;<BR>        }<BR>        <BR>        <FONT color=#0000ff>private bool</FONT> _alwaysDisplay = <FONT color=#0000ff>false</FONT>;<BR>        <FONT color=#008000>/// <FONT color=#808080><summary></FONT><BR>        /// Gets or sets if the dialog will be shown even if the credentials <BR>        /// can be returned from an existing credential in the credential manager.<BR>        /// </FONT><FONT color=#808080></summary><BR></FONT>        <FONT color=#0000ff>public bool</FONT> AlwaysDisplay<BR>        {<BR>            <FONT color=#0000ff>get</FONT><BR>            {<BR>                <FONT color=#0000ff>return</FONT> _alwaysDisplay;<BR>            }<BR>            <FONT color=#0000ff>set</FONT><BR>            {<BR>                _alwaysDisplay = <FONT color=#0000ff>value</FONT>;<BR>            }<BR>        }<BR>        <BR>        <FONT color=#0000ff>private bool</FONT> _excludeCertificates = <FONT color=#0000ff>true</FONT>;<BR>        <FONT color=#008000>/// <FONT color=#808080><summary></FONT>Gets or sets if the dialog is populated with name/password only.</FONT><FONT color=#808080></summary><BR></FONT>        <FONT color=#0000ff>public bool</FONT> ExcludeCertificates<BR>        {<BR>            <FONT color=#0000ff>get</FONT><BR>            {<BR>                <FONT color=#0000ff>return</FONT> _excludeCertificates;<BR>            }<BR>            <FONT color=#0000ff>set</FONT><BR>            {<BR>                _excludeCertificates = <FONT color=#0000ff>value</FONT>;<BR>            }<BR>        }<BR>        <BR>        <FONT color=#0000ff>private bool</FONT> _persist = <FONT color=#0000ff>true</FONT>;<BR>        <FONT color=#008000>/// <FONT color=#808080><summary></FONT>Gets or sets if the credentials are to be persisted in the credential manager</FONT><FONT color=#808080>.</summary><BR></FONT>        <FONT color=#0000ff>public bool</FONT> Persist<BR>        {<BR>            <FONT color=#0000ff>get</FONT><BR>            {<BR>                <FONT color=#0000ff>return</FONT> _persist;<BR>            }<BR>            <FONT color=#0000ff>set</FONT><BR>            {<BR>                _persist = <FONT color=#0000ff>value</FONT>;<BR>            }<BR>        }<BR>        <BR>        <FONT color=#0000ff>private bool</FONT> _keepName = <FONT color=#0000ff>false</FONT>;<BR>        <FONT color=#008000>/// <FONT color=#808080><summary></FONT>Gets or sets if the name is read-only.</FONT><FONT color=#808080></summary><BR></FONT>        <FONT color=#0000ff>public bool</FONT> KeepName<BR>        {<BR>            <FONT color=#0000ff>get</FONT><BR>            {<BR>                <FONT color=#0000ff>return</FONT> _keepName;<BR>            }<BR>            <FONT color=#0000ff>set</FONT><BR>            {<BR>                _keepName = <FONT color=#0000ff>value</FONT>;<BR>            }<BR>        }<BR>        <BR>        <FONT color=#0000ff>private string</FONT> _name = String.Empty;<BR>        <FONT color=#008000>/// <FONT color=#808080><summary></FONT>Gets or sets the name for the credentials.</FONT><FONT color=#808080></summary><BR></FONT>        <FONT color=#0000ff>public string</FONT> Name<BR>        {<BR>            <FONT color=#0000ff>get</FONT><BR>            {<BR>                <FONT color=#0000ff>return</FONT> _name;<BR>            }<BR>            <FONT color=#0000ff>set</FONT><BR>            {<BR>                <FONT color=#0000ff>if</FONT> (<FONT color=#0000ff>value</FONT> != <FONT color=#0000ff>null</FONT>)<BR>                {<BR>                    <FONT color=#0000ff>if</FONT> (<FONT color=#0000ff>value</FONT>.Length > CREDUI.MAX_USERNAME_LENGTH)<BR>                    {<BR>                        <FONT color=#0000ff>string</FONT> message = String.Format(<BR>                            Thread.CurrentThread.CurrentUICulture, <BR>                            <FONT color=#808080>"The name has a maximum length of {0} characters."</FONT>, <BR>                            CREDUI.MAX_USERNAME_LENGTH);<BR>                        <FONT color=#0000ff>throw new</FONT> ArgumentException(message, <FONT color=#808080>"Name"</FONT>);<BR>                    }<BR>                }<BR>                _name = <FONT color=#0000ff>value</FONT>;<BR>            }<BR>        }<BR>        <BR>        <FONT color=#0000ff>private string</FONT> _password = String.Empty;<BR>        <FONT color=#008000>/// <FONT color=#808080><summary></FONT>Gets or sets the password for the credentials.</FONT><FONT color=#808080></summary><BR></FONT>        <FONT color=#0000ff>public string</FONT> Password<BR>        {<BR>            <FONT color=#0000ff>get</FONT><BR>            {<BR>                <FONT color=#0000ff>return</FONT> _password;<BR>            }<BR>            <FONT color=#0000ff>set</FONT><BR>            {<BR>                <FONT color=#0000ff>if</FONT> (<FONT color=#0000ff>value</FONT> != <FONT color=#0000ff>null</FONT>)<BR>                {<BR>                    <FONT color=#0000ff>if</FONT> (<FONT color=#0000ff>value</FONT>.Length > CREDUI.MAX_PASSWORD_LENGTH)<BR>                    {<BR>                        <FONT color=#0000ff>string</FONT> message = String.Format(<BR>                            Thread.CurrentThread.CurrentUICulture, <BR>                            <FONT color=#808080>"The password has a maximum length of {0} characters."</FONT>, <BR>                            CREDUI.MAX_PASSWORD_LENGTH);<BR>                        <FONT color=#0000ff>throw new</FONT> ArgumentException(message, <FONT color=#808080>"Password"</FONT>);<BR>                    }<BR>                }<BR>                _password = <FONT color=#0000ff>value</FONT>;<BR>            }<BR>        }<BR>        <BR>        <FONT color=#0000ff>private bool</FONT> _saveChecked = <FONT color=#0000ff>false</FONT>;<BR>        <FONT color=#008000>/// <FONT color=#808080><summary></FONT>Gets or sets if the save checkbox status.</FONT><FONT color=#808080></summary><BR></FONT>        <FONT color=#0000ff>public bool</FONT> SaveChecked<BR>        {<BR>            <FONT color=#0000ff>get</FONT><BR>            {<BR>                <FONT color=#0000ff>return</FONT> _saveChecked;<BR>            }<BR>            <FONT color=#0000ff>set</FONT><BR>            {<BR>                _saveChecked = <FONT color=#0000ff>value</FONT>;<BR>            }<BR>        }<BR>        <BR>        <FONT color=#0000ff>private bool</FONT> _saveDisplayed = <FONT color=#0000ff>true</FONT>;<BR>        <FONT color=#008000>/// <FONT color=#808080><summary></FONT>Gets or sets if the save checkbox is displayed.<FONT color=#808080></summary><BR></FONT>        /// <FONT color=#808080><remarks></FONT>This value only has effect if Persist is true.</FONT><FONT color=#808080></remarks><BR></FONT>        <FONT color=#0000ff>public bool</FONT> SaveDisplayed<BR>        {<BR>            <FONT color=#0000ff>get</FONT><BR>            {<BR>                <FONT color=#0000ff>return</FONT> _saveDisplayed;<BR>            }<BR>            <FONT color=#0000ff>set</FONT><BR>            {<BR>                _saveDisplayed = <FONT color=#0000ff>value</FONT>;<BR>            }<BR>        }<BR>        <BR>        <FONT color=#0000ff>private string</FONT> _target = String.Empty;<BR>        <FONT color=#008000>/// <FONT color=#808080><summary></FONT>Gets or sets the name of the target for the credentials, typically a server name.</FONT><FONT color=#808080></summary><BR></FONT>        <FONT color=#0000ff>public string</FONT> Target<BR>        {<BR>            <FONT color=#0000ff>get</FONT><BR>            {<BR>                <FONT color=#0000ff>return</FONT> _target;<BR>            }<BR>            <FONT color=#0000ff>set</FONT><BR>            {<BR>                <FONT color=#0000ff>if</FONT> (<FONT color=#0000ff>value</FONT> == <FONT color=#0000ff>null</FONT>)<BR>                {<BR>                    <FONT color=#0000ff>throw new</FONT> ArgumentException(<FONT color=#808080>"The target cannot be a null value."</FONT>, <FONT color=#808080>"Target"</FONT>);<BR>                }<BR>                <FONT color=#0000ff>else if</FONT> (<FONT color=#0000ff>value</FONT>.Length > CREDUI.MAX_GENERIC_TARGET_LENGTH)<BR>                {<BR>                    <FONT color=#0000ff>string</FONT> message = String.Format(<BR>                        Thread.CurrentThread.CurrentUICulture, <BR>                        <FONT color=#808080>"The target has a maximum length of {0} characters."</FONT>, <BR>                        CREDUI.MAX_GENERIC_TARGET_LENGTH);<BR>                    <FONT color=#0000ff>throw new</FONT> ArgumentException(message, <FONT color=#808080>"Target"</FONT>);<BR>                }<BR>                _target = <FONT color=#0000ff>value</FONT>;<BR>            }<BR>        }<BR>        <BR>        <FONT color=#0000ff>private string</FONT> _caption = String.Empty;<BR>        <FONT color=#008000>/// <FONT color=#808080><summary></FONT>Gets or sets the caption of the dialog.<FONT color=#808080></summary><BR></FONT>        /// <FONT color=#808080><remarks></FONT>A null value will cause a system default caption to be used.</FONT><FONT color=#808080></remarks><BR></FONT>        <FONT color=#0000ff>public string</FONT> Caption<BR>        {<BR>            <FONT color=#0000ff>get</FONT><BR>            {<BR>                <FONT color=#0000ff>return</FONT> _caption;<BR>            }<BR>            <FONT color=#0000ff>set</FONT><BR>            {<BR>                <FONT color=#0000ff>if</FONT> (<FONT color=#0000ff>value</FONT> != <FONT color=#0000ff>null</FONT>)<BR>                {<BR>                    <FONT color=#0000ff>if</FONT> (<FONT color=#0000ff>value</FONT>.Length > CREDUI.MAX_CAPTION_LENGTH)<BR>                    {<BR>                        <FONT color=#0000ff>string</FONT> message = String.Format(<BR>                            Thread.CurrentThread.CurrentUICulture, <BR>                            <FONT color=#808080>"The caption has a maximum length of {0} characters."</FONT>, <BR>                            CREDUI.MAX_CAPTION_LENGTH);<BR>                        <FONT color=#0000ff>throw new</FONT> ArgumentException(message, <FONT color=#808080>"Caption"</FONT>);<BR>                    }<BR>                }<BR>                _caption = <FONT color=#0000ff>value</FONT>;<BR>            }<BR>        }<BR>        <BR>        <FONT color=#0000ff>private string</FONT> _message = String.Empty;<BR>        <FONT color=#008000>/// <FONT color=#808080><summary></FONT>Gets or sets the message of the dialog.<FONT color=#808080></summary><BR></FONT>        /// <FONT color=#808080><remarks></FONT>A null value will cause a system default message to be used.</FONT><FONT color=#808080></remarks><BR></FONT>        <FONT color=#0000ff>public string</FONT> Message<BR>        {<BR>            <FONT color=#0000ff>get</FONT><BR>            {<BR>                <FONT color=#0000ff>return</FONT> _message;<BR>            }<BR>            <FONT color=#0000ff>set</FONT><BR>            {<BR>                <FONT color=#0000ff>if</FONT> (<FONT color=#0000ff>value</FONT> != <FONT color=#0000ff>null</FONT>)<BR>                {<BR>                    <FONT color=#0000ff>if</FONT> (<FONT color=#0000ff>value</FONT>.Length > CREDUI.MAX_MESSAGE_LENGTH)<BR>                    {<BR>                        <FONT color=#0000ff>string</FONT> message = String.Format(<BR>                            Thread.CurrentThread.CurrentUICulture, <BR>                            <FONT color=#808080>"The message has a maximum length of {0} characters."</FONT>, <BR>                            CREDUI.MAX_MESSAGE_LENGTH);<BR>                        <FONT color=#0000ff>throw new</FONT> ArgumentException(message, <FONT color=#808080>"Message"</FONT>);<BR>                    }<BR>                }<BR>                _message = <FONT color=#0000ff>value</FONT>;<BR>            }<BR>        }<BR>        <BR>        <FONT color=#0000ff>private</FONT> Image _banner = <FONT color=#0000ff>null</FONT>;<BR>        <FONT color=#008000>/// <FONT color=#808080><summary></FONT>Gets or sets the image to display on the dialog.<FONT color=#808080></summary><BR></FONT>        /// <FONT color=#808080><remarks></FONT>A null value will cause a system default image to be used.</FONT><FONT color=#808080></remarks><BR></FONT>        <FONT color=#0000ff>public</FONT> Image Banner<BR>        {<BR>            <FONT color=#0000ff>get</FONT><BR>            {<BR>                <FONT color=#0000ff>return</FONT> _banner;<BR>            }<BR>            <FONT color=#0000ff>set</FONT><BR>            {<BR>                if (<FONT color=#0000ff>value</FONT> != <FONT color=#0000ff>null</FONT>)<BR>                {<BR>                    <FONT color=#0000ff>if</FONT> (<FONT color=#0000ff>value</FONT>.Width != ValidBannerWidth)<BR>                    {<BR>                        <FONT color=#0000ff>throw new</FONT> ArgumentException(<FONT color=#808080>"The banner image width must be 320 pixels."</FONT>, <FONT color=#808080>"Banner"</FONT>);<BR>                    }<BR>                    <FONT color=#0000ff>if</FONT> (<FONT color=#0000ff>value</FONT>.Height != ValidBannerHeight)<BR>                    {<BR>                        <FONT color=#0000ff>throw new</FONT> ArgumentException(<FONT color=#808080>"The banner image height must be 60 pixels."</FONT>, <FONT color=#808080>"Banner"</FONT>);<BR>                    }<BR>                }<BR>                _banner = <FONT color=#0000ff>value</FONT>;<BR>            }<BR>        }<BR>        <BR>        <FONT color=#008000>/// <FONT color=#808080><summary></FONT>Shows the credentials dialog.<FONT color=#808080></summary><BR></FONT>        /// <FONT color=#808080><returns></FONT>Returns a DialogResult indicating the user action.</FONT><FONT color=#808080></returns><BR></FONT>        <FONT color=#0000ff>public</FONT> DialogResult Show()<BR>        {<BR>            <FONT color=#0000ff>return</FONT> Show(<FONT color=#0000ff>null</FONT>, <FONT color=#0000ff>this</FONT>.Name, <FONT color=#0000ff>this</FONT>.Password, <FONT color=#0000ff>this</FONT>.SaveChecked);<BR>        }<BR>        <BR>        <FONT color=#008000>/// <FONT color=#808080><summary></FONT>Shows the credentials dialog with the specified save checkbox status.<FONT color=#808080></summary><BR></FONT>        /// <FONT color=#808080><param name="saveChecked"></FONT>True if the save checkbox is checked.<FONT color=#808080></param><BR></FONT>        /// <FONT color=#808080><returns></FONT>Returns a DialogResult indicating the user action.</FONT><FONT color=#808080></returns><BR></FONT>        <FONT color=#0000ff>public</FONT> DialogResult Show(<FONT color=#0000ff>bool</FONT> saveChecked)<BR>        {<BR>            <FONT color=#0000ff>return</FONT> Show(<FONT color=#0000ff>null</FONT>, <FONT color=#0000ff>this</FONT>.Name, <FONT color=#0000ff>this</FONT>.Password, saveChecked);<BR>        }<BR>        <BR>        <FONT color=#008000>/// <FONT color=#808080><summary></FONT>Shows the credentials dialog with the specified name.<FONT color=#808080></summary><BR></FONT>        /// <FONT color=#808080><param name="name"></FONT>The name for the credentials.<FONT color=#808080></param><BR></FONT>        /// <FONT color=#808080><returns></FONT>Returns a DialogResult indicating the user action.</FONT><FONT color=#808080></returns><BR></FONT>        <FONT color=#0000ff>public</FONT> DialogResult Show(<FONT color=#0000ff>string</FONT> name)<BR>        {<BR>            <FONT color=#0000ff>return</FONT> Show(<FONT color=#0000ff>null</FONT>, name, <FONT color=#0000ff>this</FONT>.Password, <FONT color=#0000ff>this</FONT>.SaveChecked);<BR>        }<BR>        <BR>        <FONT color=#008000>/// <FONT color=#808080><summary></FONT>Shows the credentials dialog with the specified name and password.<FONT color=#808080></summary><BR></FONT>        /// <FONT color=#808080><param name="name"></FONT>The name for the credentials.<FONT color=#808080></param><BR></FONT>        /// <FONT color=#808080><param name="password"></FONT>The password for the credentials.<FONT color=#808080></param><BR></FONT>        /// <FONT color=#808080><returns></FONT>Returns a DialogResult indicating the user action.</FONT><FONT color=#808080></returns><BR></FONT>        <FONT color=#0000ff>public</FONT> DialogResult Show(<FONT color=#0000ff>string</FONT> name, <FONT color=#0000ff>string</FONT> password)<BR>        {<BR>            <FONT color=#0000ff>return</FONT> Show(<FONT color=#0000ff>null</FONT>, name, password, <FONT color=#0000ff>this</FONT>.SaveChecked);<BR>        }<BR>        <BR>        <FONT color=#008000>/// <FONT color=#808080><summary></FONT>Shows the credentials dialog with the specified name, password and save checkbox status.<FONT color=#808080></summary><BR></FONT>        /// <FONT color=#808080><param name="name"></FONT>The name for the credentials.<FONT color=#808080></param><BR></FONT>        /// <FONT color=#808080><param name="password"></FONT>The password for the credentials.<FONT color=#808080></param><BR></FONT>        /// <FONT color=#808080><param name="saveChecked"></FONT>True if the save checkbox is checked.<FONT color=#808080></param><BR></FONT>        /// <FONT color=#808080><returns></FONT>Returns a DialogResult indicating the user action.</FONT><FONT color=#808080></returns><BR></FONT>        <FONT color=#0000ff>public</FONT> DialogResult Show(<FONT color=#0000ff>string</FONT> name, <FONT color=#0000ff>string</FONT> password, <FONT color=#0000ff>bool</FONT> saveChecked)<BR>        {<BR>            <FONT color=#0000ff>return</FONT> Show(<FONT color=#0000ff>null</FONT>, name, password, saveChecked);<BR>        }<BR>        <BR>        <FONT color=#008000>/// <FONT color=#808080><summary></FONT>Shows the credentials dialog with the specified owner.<FONT color=#808080></summary><BR></FONT>        /// <FONT color=#808080><param name="owner"></FONT>The System.Windows.Forms.IWin32Window the dialog will display in front of.<FONT color=#808080></param><BR></FONT>        /// <FONT color=#808080><returns></FONT>Returns a DialogResult indicating the user action.</FONT><FONT color=#808080></returns><BR></FONT>        <FONT color=#0000ff>public</FONT> DialogResult Show(IWin32Window owner)<BR>        {<BR>            <FONT color=#0000ff>return</FONT> Show(owner, <FONT color=#0000ff>this</FONT>.Name, <FONT color=#0000ff>this</FONT>.Password, <FONT color=#0000ff>this</FONT>.SaveChecked);<BR>        }<BR>        <BR>       <FONT color=#008000> /// <FONT color=#808080><summary></FONT>Shows the credentials dialog with the specified owner and save checkbox status.<FONT color=#808080></summary><BR></FONT>        /// <FONT color=#808080><param name="owner"></FONT>The System.Windows.Forms.IWin32Window the dialog will display in front of.<FONT color=#808080></param><BR></FONT>        /// <FONT color=#808080><param name="saveChecked"></FONT>True if the save checkbox is checked.<FONT color=#808080></param><BR></FONT>        /// <FONT color=#808080><returns></FONT>Returns a DialogResult indicating the user action.</FONT><FONT color=#808080></returns><BR></FONT>        <FONT color=#0000ff>public</FONT> DialogResult Show(IWin32Window owner, <FONT color=#0000ff>bool</FONT> saveChecked)<BR>        {<BR>            <FONT color=#0000ff>return</FONT> Show(owner, <FONT color=#0000ff>this</FONT>.Name, <FONT color=#0000ff>this</FONT>.Password, saveChecked);<BR>        }<BR>        <BR>        <FONT color=#008000>/// <FONT color=#808080><summary></FONT>Shows the credentials dialog with the specified owner, name and password.<FONT color=#808080></summary><BR></FONT>        /// <FONT color=#808080><param name="owner"></FONT>The System.Windows.Forms.IWin32Window the dialog will display in front of.<FONT color=#808080></param><BR></FONT>        /// <FONT color=#808080><param name="name"></FONT>The name for the credentials.<FONT color=#808080></param><BR></FONT>        /// <FONT color=#808080><param name="password"></FONT>The password for the credentials.<FONT color=#808080></param><BR></FONT>        /// <FONT color=#808080><returns></FONT>Returns a DialogResult indicating the user action.</FONT><FONT color=#808080></returns><BR></FONT>        <FONT color=#0000ff>public</FONT> DialogResult Show(IWin32Window owner, <FONT color=#0000ff>string</FONT> name, <FONT color=#0000ff>string</FONT> password)<BR>        {<BR>            <FONT color=#0000ff>return</FONT> Show(owner, name, password, <FONT color=#0000ff>this</FONT>.SaveChecked);<BR>        }<BR>        <BR>        <FONT color=#008000>/// <FONT color=#808080><summary></FONT>Shows the credentials dialog with the specified owner, name, password and save checkbox status.<FONT color=#808080></summary><BR></FONT>        /// <FONT color=#808080><param name="owner"></FONT>The System.Windows.Forms.IWin32Window the dialog will display in front of.<FONT color=#808080></param><BR></FONT>        /// <FONT color=#808080><param name="name"></FONT>The name for the credentials.<FONT color=#808080></param><BR></FONT>        /// <FONT color=#808080><param name="password"></FONT>The password for the credentials.<FONT color=#808080></param><BR></FONT>        /// <FONT color=#808080><param name="saveChecked"></FONT>True if the save checkbox is checked.<FONT color=#808080></param><BR></FONT>        /// <FONT color=#808080><returns></FONT>Returns a DialogResult indicating the user action.</FONT><FONT color=#808080></returns><BR></FONT>        <FONT color=#0000ff>public</FONT> DialogResult Show(IWin32Window owner, <FONT color=#0000ff>string</FONT> name, <FONT color=#0000ff>string</FONT> password, <FONT color=#0000ff>bool</FONT> saveChecked)<BR>        {<BR>            <FONT color=#0000ff>if</FONT> (Environment.OSVersion.Version.Major < 5)<BR>            {<BR>                <FONT color=#0000ff>throw new</FONT> ApplicationException(<FONT color=#808080>"The Credential Management API requires Windows XP / Windows Server 2003 or later."</FONT>);<BR>            }<BR>            <FONT color=#0000ff>this</FONT>.Name = name;<BR>            <FONT color=#0000ff>this</FONT>.Password = password;<BR>            <FONT color=#0000ff>this</FONT>.SaveChecked = saveChecked;<BR>            <BR>            <FONT color=#0000ff>return</FONT> ShowDialog(owner);<BR>        }<BR>        <BR>        <FONT color=#008000>/// <FONT color=#808080><summary></FONT>Confirmation action to be applied.<FONT color=#808080></summary><BR></FONT>        /// <FONT color=#808080><param name="value"></FONT>True if the credentials should be persisted.</FONT><FONT color=#808080></param><BR></FONT>        <FONT color=#0000ff>public void</FONT> Confirm(<FONT color=#0000ff>bool</FONT> value)<BR>        {<BR>            <FONT color=#0000ff>switch</FONT> (CREDUI.ConfirmCredentials(<FONT color=#0000ff>this</FONT>.Target, <FONT color=#0000ff>value</FONT>))<BR>            {<BR>                <FONT color=#0000ff>case</FONT> CREDUI.ReturnCodes.NO_ERROR:<BR>                    <FONT color=#0000ff>break</FONT>;<BR>                <BR>                <FONT color=#0000ff>case</FONT> CREDUI.ReturnCodes.ERROR_INVALID_PARAMETER:<BR>                    <FONT color=#008000>// for some reason, this is encountered when credentials are overwritten<BR></FONT>                    <FONT color=#0000ff>break</FONT>;<BR>                <BR>                <FONT color=#0000ff>default</FONT>:<BR>                    <FONT color=#0000ff>throw new</FONT> ApplicationException(<FONT color=#808080>"Credential confirmation failed."</FONT>);<BR>                    <FONT color=#0000ff>break</FONT>;<BR>            }<BR>        }<BR>        <BR>        <FONT color=#008000>/// <FONT color=#808080><summary></FONT>Returns a DialogResult indicating the user action.<FONT color=#808080></summary><BR></FONT>        /// <FONT color=#808080><param name="owner"></FONT>The System.Windows.Forms.IWin32Window the dialog will display in front of.<FONT color=#808080></param><BR></FONT>        /// <FONT color=#808080><remarks></FONT><BR>        /// Sets the name, password and SaveChecked accessors to the state of the dialog as it was dismissed by the user.<BR>        /// <FONT color=#808080></remarks></FONT><BR></FONT>        <FONT color=#0000ff>private</FONT> DialogResult ShowDialog(IWin32Window owner)<BR>        {<BR>            <FONT color=#008000>// set the api call parameters<BR></FONT>            StringBuilder name = <FONT color=#0000ff>new</FONT> StringBuilder(CREDUI.MAX_USERNAME_LENGTH);<BR>            name.Append(<FONT color=#0000ff>this</FONT>.Name);<BR>            <BR>            StringBuilder password = <FONT color=#0000ff>new</FONT> StringBuilder(CREDUI.MAX_PASSWORD_LENGTH);<BR>            password.Append(<FONT color=#0000ff>this</FONT>.Password);<BR>            <BR>            <FONT color=#0000ff>int</FONT> saveChecked = Convert.ToInt32(<FONT color=#0000ff>this</FONT>.SaveChecked);<BR>            <BR>            CREDUI.INFO info = GetInfo(owner);<BR>            CREDUI.FLAGS flags = GetFlags();<BR>            <BR>            <FONT color=#008000>// make the api call<BR></FONT>            CREDUI.ReturnCodes code = CREDUI.PromptForCredentials(<BR>                <FONT color=#0000ff>ref</FONT> info, <BR>                <FONT color=#0000ff>this</FONT>.Target, <BR>                IntPtr.Zero, 0, <BR>                name, CREDUI.MAX_USERNAME_LENGTH, <BR>                password, CREDUI.MAX_PASSWORD_LENGTH, <BR>                <FONT color=#0000ff>ref</FONT> saveChecked, <BR>                flags<BR>                );<BR>            <BR>            <FONT color=#008000>// clean up resources</FONT><BR>            <FONT color=#0000ff>if</FONT> (<FONT color=#0000ff>this</FONT>.Banner != <FONT color=#0000ff>null</FONT>) GDI32.DeleteObject(info.hbmBanner);<BR>            <BR>            <FONT color=#008000>// set the accessors from the api call parameters<BR></FONT>            <FONT color=#0000ff>this</FONT>.Name = name.ToString();<BR>            <FONT color=#0000ff>this</FONT>.Password = password.ToString();<BR>            <FONT color=#0000ff>this</FONT>.SaveChecked = Convert.ToBoolean(saveChecked);<BR>            <BR>            <FONT color=#0000ff>return</FONT> GetDialogResult(code);<BR>        }<BR>        <BR>       <FONT color=#008000> /// <FONT color=#808080><summary></FONT>Returns the info structure for dialog display settings.<FONT color=#808080></summary><BR></FONT>        /// <FONT color=#808080><param name="owner"></FONT>The System.Windows.Forms.IWin32Window the dialog will display in front of.</FONT><FONT color=#808080></param><BR></FONT>        <FONT color=#0000ff>private</FONT> CREDUI.INFO GetInfo(IWin32Window owner)<BR>        {<BR>            CREDUI.INFO info = <FONT color=#0000ff>new</FONT> CREDUI.INFO();<BR>            <FONT color=#0000ff>if</FONT> (owner != <FONT color=#0000ff>null</FONT>) info.hwndParent = owner.Handle;<BR>            info.pszCaptionText = <FONT color=#0000ff>this</FONT>.Caption;<BR>            info.pszMessageText = <FONT color=#0000ff>this</FONT>.Message;<BR>            <FONT color=#0000ff>if</FONT> (<FONT color=#0000ff>this</FONT>.Banner != <FONT color=#0000ff>null</FONT>)<BR>            {<BR>                info.hbmBanner = <FONT color=#0000ff>new</FONT> Bitmap(<FONT color=#0000ff>this</FONT>.Banner, ValidBannerWidth, ValidBannerHeight).GetHbitmap();<BR>            }<BR>            info.cbSize = Marshal.SizeOf(info);<BR>            <FONT color=#0000ff>return</FONT> info;<BR>        }<BR>        <BR>       <FONT color=#008000> /// <FONT color=#808080><summary></FONT>Returns the flags for dialog display options.</FONT><FONT color=#808080></summary><BR></FONT>        <FONT color=#0000ff>private</FONT> CREDUI.FLAGS GetFlags()<BR>        {<BR>            CREDUI.FLAGS flags = CREDUI.FLAGS.GENERIC_CREDENTIALS;<BR>            <BR>            <FONT color=#008000>// grrrr... can't seem to get this to work...<BR>            // if (incorrectPassword) flags = flags | CredUI.CREDUI_FLAGS.INCORRECT_PASSWORD;<BR></FONT>            <BR>            <FONT color=#0000ff>if</FONT> (<FONT color=#0000ff>this</FONT>.AlwaysDisplay) flags = flags | CREDUI.FLAGS.ALWAYS_SHOW_UI;<BR>            <BR>            <FONT color=#0000ff>if</FONT> (<FONT color=#0000ff>this</FONT>.ExcludeCertificates) flags = flags | CREDUI.FLAGS.EXCLUDE_CERTIFICATES;<BR>            <BR>            <FONT color=#0000ff>if</FONT> (<FONT color=#0000ff>this</FONT>.Persist)<BR>            {<BR>                flags = flags | CREDUI.FLAGS.EXPECT_CONFIRMATION;<BR>                <FONT color=#0000ff>if</FONT> (<FONT color=#0000ff>this</FONT>.SaveDisplayed) flags = flags | CREDUI.FLAGS.SHOW_SAVE_CHECK_BOX;<BR>            }<BR>            <FONT color=#0000ff>else</FONT><BR>            {<BR>                flags = flags | CREDUI.FLAGS.DO_NOT_PERSIST;<BR>            }<BR>            <BR>            <FONT color=#0000ff>if</FONT> (<FONT color=#0000ff>this</FONT>.KeepName) flags = flags | CREDUI.FLAGS.KEEP_USERNAME;<BR>            <BR>            <FONT color=#0000ff>return</FONT> flags;<BR>        }<BR>        <BR>        <FONT color=#008000>/// <FONT color=#808080><summary></FONT>Returns a DialogResult from the specified code.<FONT color=#808080></summary><BR></FONT>        /// <FONT color=#808080><param name="code"></FONT>The credential return code.</FONT><FONT color=#808080></param><BR></FONT>        <FONT color=#0000ff>private</FONT> DialogResult GetDialogResult(CREDUI.ReturnCodes code)<BR>        {<BR>            DialogResult result;<BR>            <FONT color=#0000ff>switch</FONT> (code)<BR>            {<BR>                <FONT color=#0000ff>case</FONT> CREDUI.ReturnCodes.NO_ERROR:<BR>                    result = DialogResult.OK;<BR>                    <FONT color=#0000ff>break</FONT>;<BR>                <BR>                <FONT color=#0000ff>case</FONT> CREDUI.ReturnCodes.ERROR_CANCELLED:<BR>                    result = DialogResult.Cancel;<BR>                    <FONT color=#0000ff>break</FONT>;<BR>                <BR>                <FONT color=#0000ff>case</FONT> CREDUI.ReturnCodes.ERROR_NO_SUCH_LOGON_SESSION:<BR>                    <FONT color=#0000ff>throw new</FONT> ApplicationException(<FONT color=#808080>"No such logon session."</FONT>);<BR>                    <FONT color=#0000ff>break</FONT>;<BR>                <BR>                <FONT color=#0000ff>case</FONT> CREDUI.ReturnCodes.ERROR_NOT_FOUND:<BR>                    <FONT color=#0000ff>throw new</FONT> ApplicationException(<FONT color=#808080>"Not found."</FONT>);<BR>                    <FONT color=#0000ff>break</FONT>;<BR>                <BR>                <FONT color=#0000ff>case</FONT> CREDUI.ReturnCodes.ERROR_INVALID_ACCOUNT_NAME:<BR>                    <FONT color=#0000ff>throw new</FONT> ApplicationException(<FONT color=#808080>"Invalid account name."</FONT>);<BR>                    <FONT color=#0000ff>break</FONT>;<BR>                <BR>                <FONT color=#0000ff>case</FONT> CREDUI.ReturnCodes.ERROR_INSUFFICIENT_BUFFER:<BR>                    <FONT color=#0000ff>throw new</FONT> ApplicationException(<FONT color=#808080>"Insufficient buffer."</FONT>);<BR>                    <FONT color=#0000ff>break</FONT>;<BR>                <BR>                <FONT color=#0000ff>case</FONT> CREDUI.ReturnCodes.ERROR_INVALID_PARAMETER:<BR>                    <FONT color=#0000ff>throw new</FONT> ApplicationException(<FONT color=#808080>"Invalid parameter."</FONT>);<BR>                    <FONT color=#0000ff>break</FONT>;<BR>                <BR>                <FONT color=#0000ff>case</FONT> CREDUI.ReturnCodes.ERROR_INVALID_FLAGS:<BR>                    <FONT color=#0000ff>throw new</FONT> ApplicationException(<FONT color=#808080>"Invalid flags."</FONT>);<BR>                    <FONT color=#0000ff>break</FONT>;<BR>                <BR>                <FONT color=#0000ff>default</FONT>:<BR>                    <FONT color=#0000ff>throw new</FONT> ApplicationException(<FONT color=#808080>"Unknown credential result encountered."</FONT>);<BR>                    <FONT color=#0000ff>break</FONT>;<BR>            }<BR>            <FONT color=#0000ff>return</FONT> result;<BR>        }<BR>    }<BR>    <BR>    <FONT color=#0000ff>public sealed class</FONT> GDI32<BR>    {<BR>        <FONT color=#0000ff>private</FONT> GDI32()<BR>        { }<BR>        <BR>        [DllImport(<FONT color=#808080>"gdi32.dll"</FONT>, EntryPoint=<FONT color=#808080>"DeleteObject"</FONT>)]<BR>        <FONT color=#0000ff>public static extern bool</FONT> DeleteObject(IntPtr hObject);<BR>    }<BR>    <BR>    <FONT color=#0000ff>public sealed class</FONT> CREDUI<BR>    {<BR>        <FONT color=#0000ff>private</FONT> CREDUI()<BR>        { }<BR>        <BR>        <FONT color=#008000>/// <FONT color=#808080><summary></FONT>http://msdn.microsoft.com/library/default.asp?url=/library/en-us/secauthn/security/authentication_constants.asp</FONT><FONT color=#808080></summary><BR></FONT>        <FONT color=#0000ff>public const int</FONT> MAX_MESSAGE_LENGTH        = 100;<BR>        <FONT color=#0000ff>public const int</FONT> MAX_CAPTION_LENGTH        = 100;<BR>        <FONT color=#0000ff>public const int</FONT> MAX_GENERIC_TARGET_LENGTH = 100;<BR>        <FONT color=#0000ff>public const int</FONT> MAX_DOMAIN_TARGET_LENGTH  = 100;<BR>        <FONT color=#0000ff>public const int</FONT> MAX_USERNAME_LENGTH       = 100;<BR>        <FONT color=#0000ff>public const int</FONT> MAX_PASSWORD_LENGTH       = 100;<BR>        <BR>        <FONT color=#008000>/// <FONT color=#808080><summary><BR></FONT>        /// http://www.pinvoke.net/default.aspx/Enums.CREDUI_FLAGS<BR>        /// http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dnnetsec/html/dpapiusercredentials.asp<BR>        /// http://msdn.microsoft.com/library/default.asp?url=/library/en-us/secauthn/security/creduipromptforcredentials.asp<BR>        ///<FONT color=#808080> </summary></FONT><BR></FONT>        [Flags] <FONT color=#0000ff>public enum</FONT> FLAGS<BR>        {<BR>            INCORRECT_PASSWORD          = 0x1,<BR>            DO_NOT_PERSIST              = 0x2,<BR>            REQUEST_ADMINISTRATOR       = 0x4,<BR>            EXCLUDE_CERTIFICATES        = 0x8,<BR>            REQUIRE_CERTIFICATE         = 0x10,<BR>            SHOW_SAVE_CHECK_BOX         = 0x40,<BR>            ALWAYS_SHOW_UI              = 0x80,<BR>            REQUIRE_SMARTCARD           = 0x100,<BR>            PASSWORD_ONLY_OK            = 0x200,<BR>            VALIDATE_USERNAME           = 0x400,<BR>            COMPLETE_USERNAME           = 0x800,<BR>            PERSIST                     = 0x1000,<BR>            SERVER_CREDENTIAL           = 0x4000,<BR>            EXPECT_CONFIRMATION         = 0x20000,<BR>            GENERIC_CREDENTIALS         = 0x40000,<BR>            USERNAME_TARGET_CREDENTIALS = 0x80000,<BR>            KEEP_USERNAME               = 0x100000,<BR>        }<BR>        <BR>        <FONT color=#008000>/// <FONT color=#808080><summary></FONT>http://www.pinvoke.net/default.aspx/Enums.CredUIReturnCodes</FONT><FONT color=#808080></summary><BR></FONT>        <FONT color=#0000ff>public enum</FONT> ReturnCodes<BR>        {<BR>            NO_ERROR                    = 0,<BR>            ERROR_INVALID_PARAMETER     = 87,<BR>            ERROR_INSUFFICIENT_BUFFER   = 122,<BR>            ERROR_INVALID_FLAGS         = 1004,<BR>            ERROR_NOT_FOUND             = 1168,<BR>            ERROR_CANCELLED             = 1223,<BR>            ERROR_NO_SUCH_LOGON_SESSION = 1312,<BR>            ERROR_INVALID_ACCOUNT_NAME  = 1315<BR>        }<BR>        <BR>        <FONT color=#008000>/// <FONT color=#808080><summary></FONT><BR>        /// http://www.pinvoke.net/default.aspx/Structures.CREDUI_INFO<BR>        /// http://msdn.microsoft.com/library/default.asp?url=/library/en-us/secauthn/security/credui_info.asp<BR>        /// <FONT color=#808080></summary></FONT><BR></FONT>        <FONT color=#0000ff>public struct</FONT> INFO<BR>        {<BR>            <FONT color=#0000ff>public int</FONT> cbSize;<BR>            <FONT color=#0000ff>public</FONT> IntPtr hwndParent;<BR>            [MarshalAs(UnmanagedType.LPWStr)] <FONT color=#0000ff>public string</FONT> pszMessageText;<BR>            [MarshalAs(UnmanagedType.LPWStr)] <FONT color=#0000ff>public string</FONT> pszCaptionText;<BR>            <FONT color=#0000ff>public</FONT> IntPtr hbmBanner;<BR>        }<BR>        <BR>        <FONT color=#008000>/// <FONT color=#808080><summary></FONT><BR>        /// http://www.pinvoke.net/default.aspx/credui.CredUIPromptForCredentialsW<BR>        /// http://msdn.microsoft.com/library/default.asp?url=/library/en-us/secauthn/security/creduipromptforcredentials.asp<BR>        /// <FONT color=#808080></summary></FONT><BR></FONT>        [DllImport(<FONT color=#808080>"credui"</FONT>, EntryPoint=<FONT color=#808080>"CredUIPromptForCredentialsW"</FONT>, CharSet=CharSet.Unicode)]<BR>        <FONT color=#0000ff>public static extern</FONT> ReturnCodes PromptForCredentials(<BR>            <FONT color=#0000ff>ref</FONT> INFO creditUR, <BR>            <FONT color=#0000ff>string</FONT> targetName,<BR>            IntPtr reserved1,<BR>            <FONT color=#0000ff>int</FONT> iError,<BR>            StringBuilder userName,<BR>            <FONT color=#0000ff>int</FONT> maxUserName,<BR>            StringBuilder password,<BR>  &nbsp