public int AuthenticateUser(string userid, string pwd)
 {
     int retVal = 0;
         try
         {
             using (AssociateConnDataContext asscon = new AssociateConnDataContext())
             {
                 retVal = asscon.validateUser(userid,pwd);
             }
         }
         catch (Exception e)
         {
             throw e;
         }
         return retVal;
 }