How to add ModelState.AddModelError message when model item is not binded

Question

I am new to MVC4. Here I added the ModelState.AddModelError message to display when the delete operation is not possible.

Answer 1

RedirectToAction will clear ModelState. You must return a view in order to use this data. Therefore, the first if case won't work. Also, ensure that you have a control in your view (like ValidationSummary) which displays the error... this could be the problem in the second case.