When i submit the form without selecting any value vs through this exception: i want to know how to handle the validation for this dropdown list

Question

1.00/5 (2 votes)

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.NET4.5

There is no ViewData item of type 'IEnumerable<SelectListItem>' that has the key 'categoryId'.

This is my code
Controller:
[HttpGet]

C#

public ActionResult AddNewProduct()
       {

C#

ViewBag.Category = new List<SelectListItem>
                               {

                                   new SelectListItem{Text="DELL",Value="1"},
                                   new SelectListItem{Text="HP",Value="2"},
                                   new SelectListItem{Text="APPLE",Value="3"},
                                   new SelectListItem{Text="ACER",Value="4"},
                                   new SelectListItem{Text="LENOVO",Value="5"},
                                   new SelectListItem{Text="SAMSUNG",Value="6"},
                                   new SelectListItem{Text="ASUS",Value="7"}
                               };


           return View("AddNewProduct");
       }

//Razor View

@Html.DropDownListFor(
m => m.categoryId,
@ViewBag.Category as List<SelectListItem>,
new { @class="dropdownList", style = "width:25%;" })

What I have tried:

http://www.asp.net/mvc/overview/older-versions/working-with-the-dropdownlist-box-and-jquery/using-the-dropdownlist-helper-with-aspnet-mvc

Posted 13-Feb-16 7:26am

Nouman janjua

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Dave Kreskowiak · Answer 1 · 2016-02-13T10:03:00

The model you passed into the Razor view from your controller doesn't have a property called "categoryId". How much more clearer does the error message have to be?

We can't say anything else about it because you haven't shown the appropriate code. You show nothing from the controller returning this view and nothing of the Razor view that should be getting a view model object from the controller.