// GET: Home
        public ActionResult mathAddition()
        {
            modelAdd _modelAdd = new modelAdd();

            ViewBag.Result = "";
            return(View(_modelAdd));
        }
 public ActionResult mathAddition(modelAdd _modelAdd)
 {
     try
     {
         if (ModelState.IsValid)
         {
             string Result = (int.Parse(_modelAdd.number1) + int.Parse(_modelAdd.number2)).ToString();
             // ModelState.Clear();
             // ModelState["result"].Value = Result;
             ModelState.SetModelValue("result", new ValueProviderResult(Result, "", CultureInfo.InvariantCulture));
         }
         return(View());
     }
     catch (Exception ex)
     {
         Response.Write(ex.Message);
         return(null);
     }
 }