ModelState.AddModelError not showing any message

Question

I am using telerik mvc grid. In my table I have unique key defined for a field. And in controller I am catching the error using try ... catch inside DbUpdateException.

in catch block I want to handle the error and show error messsage in view. So using following line,

ModelState.AddModelError("PROGRAM_ID", "Access for this program already exists.");
return View();

But this is not showing error message. Any idea why?

Answer 1

Make sure that you have a corresponding ValidationMessage in your view with the same key:

@Html.ValidationMessage("PROGRAM_ID")

Answer 2

ValidationSummary will only display ModelErrors for string.empty as the key. To display an error added with ModelState.AddModelError in your validationsummary, change your code to:

ModelState.AddModelError(string.Empty, "Access for this program already exists.");