C#

   public static void Main(string[] args)
   {
      IntPtr tokenHandle = new IntPtr(0);
      IntPtr dupeTokenHandle = new IntPtr(0);    

      try
      {
         string userName, domainName;
                
     //USE YOUR LOGIN INFO HERE
         domainName = "mydomain";
         userName = "user"; 
         pwd="mypass";      
     
         tokenHandle = IntPtr.Zero;
         dupeTokenHandle = IntPtr.Zero;
       
         bool returnValue = LogonUser(userName, domainName, pwd,
             LOGON32_LOGON_INTERACTIVE, LOGON32_PROVIDER_DEFAULT,
             ref tokenHandle);
                
         if(false == returnValue)
         {
            int ret = Marshal.GetLastWin32Error();
            Console.WriteLine("LogonUser failed with error code : {0}", ret);          
            int errorCode = 0x5;
            throw new System.ComponentModel.Win32Exception(errorCode);
         }

         SECURITY_ATTRIBUTES pSec = new SECURITY_ATTRIBUTES();
         SECURITY_ATTRIBUTES tSec = new SECURITY_ATTRIBUTES();
         pSec.nLength = Marshal.SizeOf(pSec);
         tSec.nLength = Marshal.SizeOf(tSec);
               
         bool retVal = DuplicateTokenEx(tokenHandle, (uint)TokenAccessLevels.AllAccess, ref pSec,
                                        SECURITY_IMPERSONATION_LEVEL.SecurityIdentification, TOKEN_TYPE.TokenPrimary,
                                        out dupeTokenHandle);
         if(false == retVal)
         {
            CloseHandle(tokenHandle);
            Console.WriteLine("Exception thrown in trying to duplicate token.");
            return;
         }

         WindowsIdentity newId = new WindowsIdentity(dupeTokenHandle);
         WindowsImpersonationContext impersonatedUser = newId.Impersonate();
                
         PROFILEINFO aPI = new PROFILEINFO();
         aPI.dwSize = 32;
         aPI.lpUserName = WindowsIdentity.GetCurrent().Name;
       
         bool retLoadProfile = LoadUserProfile(newId.Token, ref aPI);

         StringBuilder CommandLine = new StringBuilder(@"cmd /c C:\windows\system32\notepad.exe");       
         const uint NORMAL_PRIORITY_CLASS = 0x0020;
         PROCESS_INFORMATION pInfo = new PROCESS_INFORMATION();
         STARTUPINFO sInfo = new STARTUPINFO();

         IntPtr aToken=newId.Token;
         SetPrivs(ref aToken);

         sInfo.wShowWindow = 5;
         sInfo.lpTitle = "Hello!";
         sInfo.lpDesktop="winsta0\\default";

         uint dwCreationFlags = NORMAL_PRIORITY_CLASS| CREATE_NEW_CONSOLE;
         IntPtr pEnv = IntPtr.Zero;
         if(CreateEnvironmentBlock(out pEnv, dupeTokenHandle, true))
         {
            dwCreationFlags |= CREATE_UNICODE_ENVIRONMENT;
         }
         else
         {
            pEnv = IntPtr.Zero;
         }
                
         bool retCreateProcess = CreateProcessAsUser(newId.Token,
                                                     null,
                                                     CommandLine,
                                                     ref pSec,
                                                     ref tSec,
                                                     false,
                                                     NORMAL_PRIORITY_CLASS,
                                                     pEnv,
                                                     null,
                                                     ref sInfo,
                                                     out pInfo);

         int err = Marshal.GetLastWin32Error();
         Console.WriteLine("CreateProcess="+retCreateProcess.ToString()+". With error:"+ err.ToString());
       
         // Check the identity.
         Console.WriteLine("After impersonation: " + WindowsIdentity.GetCurrent().Name);

         Console.ReadKey();       

         // Stop impersonating the user.
         impersonatedUser.Undo();

         // Free the tokens.
         if(tokenHandle != IntPtr.Zero)
            CloseHandle(tokenHandle);
         if(dupeTokenHandle != IntPtr.Zero)
            CloseHandle(dupeTokenHandle);
      }
      catch(Exception ex)
      {
         Console.WriteLine("Exception occurred. " + ex.Message);
      }

   }
}

private static bool SetPrivs(ref IntPtr theToken)
   {
      const int SE_PRIVILEGE_ENABLED = 0x0002;
     
      List<string> aPrivs = new List<string>();

      aPrivs.Add(SE_CREATE_TOKEN_NAME);
      aPrivs.Add(SE_ASSIGNPRIMARYTOKEN_NAME);
      aPrivs.Add(SE_LOCK_MEMORY_NAME);
      aPrivs.Add(SE_INCREASE_QUOTA_NAME);
      aPrivs.Add(SE_UNSOLICITED_INPUT_NAME);
      aPrivs.Add(SE_MACHINE_ACCOUNT_NAME);
      aPrivs.Add(SE_TCB_NAME);
      aPrivs.Add(SE_SECURITY_NAME);
      aPrivs.Add(SE_TAKE_OWNERSHIP_NAME);
      aPrivs.Add(SE_LOAD_DRIVER_NAME);
      aPrivs.Add(SE_SYSTEM_PROFILE_NAME);
      aPrivs.Add(SE_SYSTEMTIME_NAME);
      aPrivs.Add(SE_PROF_SINGLE_PROCESS_NAME);
      aPrivs.Add(SE_INC_BASE_PRIORITY_NAME);
      aPrivs.Add(SE_CREATE_PAGEFILE_NAME);
      aPrivs.Add(SE_CREATE_PERMANENT_NAME);
      aPrivs.Add(SE_BACKUP_NAME);
      aPrivs.Add(SE_RESTORE_NAME);
      aPrivs.Add(SE_SHUTDOWN_NAME);
      aPrivs.Add(SE_DEBUG_NAME);
      aPrivs.Add(SE_AUDIT_NAME);
      aPrivs.Add(SE_SYSTEM_ENVIRONMENT_NAME);
      aPrivs.Add(SE_CHANGE_NOTIFY_NAME);
      aPrivs.Add(SE_REMOTE_SHUTDOWN_NAME);
      aPrivs.Add(SE_UNDOCK_NAME);
      aPrivs.Add(SE_SYNC_AGENT_NAME);
      aPrivs.Add(SE_ENABLE_DELEGATION_NAME);
      aPrivs.Add(SE_MANAGE_VOLUME_NAME);
      aPrivs.Add(SE_IMPERSONATE_NAME);
      aPrivs.Add(SE_CREATE_GLOBAL_NAME);
           
      SetCurrProcPriv(SE_TCB_NAME);
     
      foreach(string aPriv in aPrivs)
      {
         TOKEN_PRIVILEGES aTP = new TOKEN_PRIVILEGES();
         LUID luid = new LUID();

         aTP.PrivilegeCount = 1;
         aTP.Privileges = new int[3];
         aTP.Privileges[2] = SE_PRIVILEGE_ENABLED;
         aTP.Privileges[1] = luid.HighPart;
         aTP.Privileges[0] = luid.LowPart;

         try
         {
            LookupPrivilegeValue(IntPtr.Zero, aPriv, ref luid);           
           
            bool isSuccess=AdjustTokenPrivileges(theToken, false, ref aTP, Marshal.SizeOf(aTP), IntPtr.Zero, IntPtr.Zero);
            if(!isSuccess)
               return false;
            else
               return true;
         }
         catch (Exception e)
         {
            Console.WriteLine(e.Message);
            Console.ReadKey();     
         }
      }

      return false;
   }


   private static IntPtr SetCurrProcPriv(string thePrivilegeName)
   {       
    IntPtr hToken =new IntPtr();
    bool isSuccess=false;       
    LUID luid = new LUID();
    IntPtr aCurrProc = GetCurrentProcess();
           
    TOKEN_PRIVILEGES aTP=new  TOKEN_PRIVILEGES();   
    STARTUPINFO si=new STARTUPINFO();
    si.cb = (int)Marshal.SizeOf(si);

    isSuccess = OpenProcessToken(aCurrProc,
        TOKEN_QUERY |  TOKEN_ADJUST_PRIVILEGES |
        TOKEN_ADJUST_SESSIONID |TOKEN_ADJUST_DEFAULT |
        TOKEN_ASSIGN_PRIMARY | TOKEN_DUPLICATE, out hToken);

    if(!isSuccess)
        Console.WriteLine("Error OpenProcessToken " + Marshal.GetLastWin32Error().ToString());

     isSuccess = LookupPrivilegeValue(IntPtr.Zero, thePrivilegeName, ref luid);
    if(!isSuccess)
        Console.WriteLine("Error OpenProcessToken " + Marshal.GetLastWin32Error().ToString());
      
    aTP.PrivilegeCount = 1;
    aTP.Privileges = new int[3];
    aTP.Privileges[0] = luid.LowPart;
    aTP.Privileges[1] = luid.HighPart;
    aTP.Privileges[2] = SE_PRIVILEGE_ENABLED;

    isSuccess = AdjustTokenPrivileges(hToken, false, ref aTP, Marshal.SizeOf(aTP), IntPtr.Zero, (IntPtr)Marshal.SizeOf(aTP));
    if(!isSuccess)
       return IntPtr.Zero;
    else
       return hToken;       
   
   }

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