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public bool Login(string UserName, string Password, string Domain)
{
      string text1 = Domain.Trim();
      string text2 = UserName.Trim();
      text2 = text2.Replace("/", @"\");
      int num1 = text2.IndexOf('\\');
      if (num1 != -1)
      {
            text1 = text2.Substring(0, num1);
            text2 = text2.Substring(num1 + 1);
      }
      else
      {
            num1 = text2.IndexOf('@');
            if (num1 != -1)
            {
                  text1 = text2.Substring(num1 + 1);
                  text2 = text2.Substring(0, num1);
            }
      }
      return this.authenticateUser(text2, Password.Trim(), text1);
}

private bool authenticateUser(string UserName, string Password, string Domain)
{
      bool flag1 = false;
      try
      {
            int num1;
            IntPtr ptr1;
            if (!WindowsAuth.LogonUser(UserName, Domain, Password, 2, 0, out num1))
            {
                  return flag1;
            }
            ptr1 = new IntPtr(num1);
            WindowsIdentity identity1 = new WindowsIdentity(ptr1);
            WindowsPrincipal principal1 = new WindowsPrincipal(identity1);
            HttpContext.Current.User = principal1;
            FormsAuthentication.SetAuthCookie(principal1.Identity.Name, false);
            FormsAuthentication.RedirectFromLoginPage(UserName, false);
            flag1 = true;
      }
      catch (Exception)
      {
      }
      return flag1;
}