bool returnValue = LogonUser(strUsername, strDomain, strPassword,
                    LOGON32_LOGON_NEW_CREDENTIALS,
                    LOGON32_PROVIDER_DEFAULT, ref tokenHandle);
                bool retVal = DuplicateToken(tokenHandle, SecurityImpersonation, ref dupeTokenHandle);
                if (false == retVal)
                {
                    errCode = Marshal.GetLastWin32Error();
                    CloseHandle(tokenHandle);
                    Console.WriteLine("Exception in token duplication.");
                    return errCode;
                }
                WindowsIdentity newId = new WindowsIdentity(tokenHandle);
                impersonatedUser = newId.Impersonate();