How to check the value in querystring is number or not in Asp.Net

if (!String.IsNullOrEmpty(Request.QueryString["Id"]))

 {

   string Id = Request.QueryString["Id"].ToString();

   if (Id != "")

     {

        int numeber = 0;

        if (int.TryParse(Id, out number))

          {

         //code

          }

         else

          {

            Server.Transfer("Error.aspx");

          }

     }

     else

      {

         Server.Transfer("Error.aspx");

}

 }