how to check the value received from controller is not null in view in asp.net mvc?

Question

this is my controller

public ActionResult Index()
    {
        return View();
    }
    [HttpPost]
    public ActionResult Validate(HttpPostedFileBase excelfile)
    {
        if(excelfile==null || excelfile.ContentLength==0)
        {
            TempData["Message"] = "Please select a excel file";
            return View("Index");

       }

From here i am passing a TempData["Message"] to view.how to check whether TempData["Message"] is not null in view ?

And in my view i am using <script> @TempData["Message"]</script> to give a alert

Answer 1

you can use:

@if (TempData["Message"] != null)
    {
      @TempData["Message"].ToString()
   }

Answer 2

Try like this ,it will fix your issue

$(document).ready(function() {
var success = @((TempData["Message"] != null).ToString().ToLower());

if (success == true) {
        //Do your code here
  }
});