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copied!<p>See sample code how you can do it:</p> <pre><code>using System; using System.Runtime.InteropServices; using System.Security.Principal; using System.Security.Permissions; [assembly: SecurityPermissionAttribute(SecurityAction.RequestMinimum, UnmanagedCode = true)] [assembly: PermissionSetAttribute(SecurityAction.RequestMinimum, Name = "FullTrust")] public class ImpersonationDemo { [DllImport("advapi32.dll", SetLastError = true)] public static extern bool LogonUser( String lpszUsername, String lpszDomain, String lpszPassword, int dwLogonType, int dwLogonProvider, ref IntPtr phToken); [DllImport("kernel32.dll", CharSet = CharSet.Auto)] public extern static bool CloseHandle(IntPtr handle); // Test harness. // If you incorporate this code into a DLL, be sure to demand FullTrust. [PermissionSetAttribute(SecurityAction.Demand, Name = "FullTrust")] public static void Main(string[] args) { IntPtr tokenHandle = new IntPtr(0); try { string userName, domainName; // Get the user token for the specified user, domain, and password using the // unmanaged LogonUser method. // The local machine name can be used for the domain name to impersonate a user on this machine. Console.Write("Enter the name of the domain on which to log on: "); domainName = Console.ReadLine(); Console.Write("Enter the login of a user on {0} that you wish to impersonate: ", domainName); userName = Console.ReadLine(); Console.Write("Enter the password for {0}: ", userName); const int LOGON32_PROVIDER_DEFAULT = 0; //This parameter causes LogonUser to create a primary token. const int LOGON32_LOGON_INTERACTIVE = 2; tokenHandle = IntPtr.Zero; // Call LogonUser to obtain a handle to an access token. bool returnValue = LogonUser( userName, domainName, Console.ReadLine(), 3, LOGON32_PROVIDER_DEFAULT, ref tokenHandle); Console.WriteLine("LogonUser called."); if (false == returnValue) { int ret = Marshal.GetLastWin32Error(); Console.WriteLine("LogonUser failed with error code : {0}", ret); throw new System.ComponentModel.Win32Exception(ret); } Console.WriteLine("Did LogonUser Succeed? " + (returnValue ? "Yes" : "No")); Console.WriteLine("Value of Windows NT token: " + tokenHandle); // Check the identity. Console.WriteLine("Before impersonation: " + WindowsIdentity.GetCurrent().Name); // Use the token handle returned by LogonUser. WindowsIdentity newId = new WindowsIdentity(tokenHandle); using (WindowsImpersonationContext impersonatedUser = newId.Impersonate()) { // Check the identity. Here you shoul place code that will be executed on belaf of other login. Console.WriteLine("After impersonation: " + WindowsIdentity.GetCurrent().Name); GC.KeepAlive(impersonatedUser); } // Check the identity. Console.WriteLine("After Undo: " + WindowsIdentity.GetCurrent().Name); // Free the tokens. if (tokenHandle != IntPtr.Zero) CloseHandle(tokenHandle); } catch (Exception ex) { Console.WriteLine("Exception occurred. " + ex.Message); } } } </code></pre>

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