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copied!<p>I think this <a href="http://support.microsoft.com/kb/841699" rel="nofollow noreferrer">article</a> might help you.</p> <p>Let me know if you face any problem while understanding the code.</p> <p><strong>Edit 1 :</strong> I am confused with your question.</p> <blockquote> <p>my idea: According above Windows shoud be provide some vay to validate and enter username and password</p> </blockquote> <p>Do you want to validate a entered username and password?</p> <hr> <p>Ahh, sorry for the delay. Here's the converted c# code</p> <p>Add following namespaces:</p> <pre><code>using System.Security.Principal; using System.Security.Permissions; using System.Runtime.InteropServices; </code></pre> <p>And then here goes the main code :</p> <pre><code>namespace WindowsAccount { public partial class Form1 : Form { [DllImport("advapi32.dll", SetLastError = true)] public static extern bool LogonUser(string lpszUsername, string lpszDomain, string lpszPassword, int dwLogonType, int dwLogonProvider, out IntPtr phToken ); [DllImport("kernel32.dll")] public static extern int FormatMessage(int dwFlags, ref IntPtr lpSource, int dwMessageId, int dwLanguageId, ref String lpBuffer, int nSize, ref IntPtr Arguments); [DllImport("kernel32.dll", SetLastError = true)] [return: MarshalAs(UnmanagedType.Bool)] static extern bool CloseHandle(IntPtr hObject); public static string GetErrorMessage(int errorCode) { int FORMAT_MESSAGE_ALLOCATE_BUFFER = 0x100; int FORMAT_MESSAGE_IGNORE_INSERTS = 0x200; int FORMAT_MESSAGE_FROM_SYSTEM = 0x1000; int msgSize = 255; string lpMsgBuf = null; int dwFlags = FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS; IntPtr lpSource = IntPtr.Zero; IntPtr lpArguments = IntPtr.Zero; int returnVal = FormatMessage(dwFlags, ref lpSource, errorCode, 0, ref lpMsgBuf, msgSize, ref lpArguments); if (returnVal == 0) { throw new Exception("Failed to format message for error code " + errorCode.ToString() + ". "); } return lpMsgBuf; } public Form1() { InitializeComponent(); } private void btnLogin_Click(object sender, EventArgs e) { IntPtr tokenHandle = new IntPtr(0); try { string UserName = null; string MachineName = null; string Pwd = null; //The MachineName property gets the name of your computer. MachineName = System.Environment.MachineName; UserName = txtUser.Text; Pwd = txtPass.Text; const int LOGON32_PROVIDER_DEFAULT = 0; const int LOGON32_LOGON_INTERACTIVE = 2; tokenHandle = IntPtr.Zero; //Call the LogonUser function to obtain a handle to an access token. bool returnValue = LogonUser(UserName, MachineName, Pwd, LOGON32_LOGON_INTERACTIVE, LOGON32_PROVIDER_DEFAULT, out tokenHandle); if (returnValue == false) { //This function returns the error code that the last unmanaged function returned. int ret = Marshal.GetLastWin32Error(); string errmsg = GetErrorMessage(ret); MessageBox.Show(errmsg); } else { //Create the WindowsIdentity object for the Windows user account that is //represented by the tokenHandle token. WindowsIdentity newId = new WindowsIdentity(tokenHandle); WindowsPrincipal userperm = new WindowsPrincipal(newId); //Verify whether the Windows user has administrative credentials. if (userperm.IsInRole(WindowsBuiltInRole.Administrator)) { MessageBox.Show("Access Granted. User is admin"); } else { MessageBox.Show("Access Granted. User is not admin"); } } CloseHandle(tokenHandle); } catch (Exception ex) { MessageBox.Show("Exception occurred. " + ex.Message); } } } } </code></pre> <p>Let me know if you face any problem.</p>

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