How can i solve my this issue in MVC grid Delete Controller

Question

 Controller: 

          public ActionResult Delete(int id)
                    {
     Student _std = new Student();
                    var abc = _dbcon.StudentList.Where(c => c.Roll_ID.Equals(id)).SingleOrDefault();
                    _dbcon.StudentList.Remove(abc);
                    _dbcon.SaveChanges();
                    return View("Test");

                }
    This is my view and the error comes at foreach loop
    View:

                   @foreach (StudentViewModel _EachStd in @Model.StudentList)
                 {
                            <tr>
                                <td>  @_EachStd.Roll_ID</td>
                                <td> @_EachStd.Name</td>
                                <td> @_EachStd.Maths</td>
                                <td> @_EachStd.Urdu</td>
                                <td> @_EachStd.English</td>
                                <td>@_EachStd.ObtainNumber</td>
                                <td>@_EachStd.Percentage</td>
                                <td> @_EachStd.Grade</td>
                              <td>@Html.ActionLink("Edit", "Edit", "Home", new {id= @_EachStd.Roll_ID },null)</td>
                                <td>@Html.ActionLink("Delete", "Delete", "Home", new { id = @_EachStd.Roll_ID }, null)</td>
                            </tr>
                }
            </tbody>
                </table>

I got Null Error exception, but after refresh i got the record delete. But why the error occur I dont get It.Whenever i run this code my Edit controller is working correctly but my Delete controller is not working correctly, and error is occur like there is "Null erroe exception"

It's not clear at all what the problem is or what you're asking. Please provide clear and readable code along with a description of the problem and what you're attempting to achieve. — David, Feb 28 '19 at 12:48
Now i clearly provide everything please guide me as soon as possible — Faraz Siddique, Feb 28 '19 at 13:19
Already voted to close for a different reason, but now it also sounds like this is a duplicate of another oft-cited question: https://stackoverflow.com/questions/4660142/what-is-a-nullreferenceexception-and-how-do-i-fix-it — David, Feb 28 '19 at 13:20

score 0 · Answer 1 · answered Feb 28 '19 at 13:25

error is occur like there is "Null erroe exception"

You mean a NullReferenceException? That would mean something is null that you're trying to use as though it has a value.

This is my view and the error comes at foreach loop

So then something on this line is null?:

@foreach (StudentViewModel _EachStd in @Model.StudentList)

The only thing you're trying to dereference on that line is Model. So it follows that Model is null. Are you passing a model to your view?

return View("Test");

No, you are not. You need to pass a model to your view in order to use that model within your view.

As an aside, returning a view from this delete operation probably isn't the way to go in the first place. Consider that the user would now be on the URL /Home/Delete and viewing it as a page. This would quickly get confusing for both the user and your code.

Instead of returning a view, especially one without a model, redirect the user to the action which builds the model and displays the view. Which in your code could be something as simple as:

return RedirectToAction("Test");

I did everything but still have same issue, the problem is that, when i click on my delete button, it goes to my code and give me error of null exception. When i reload my project and run again, the record is deleted which i want to delete. — Faraz Siddique, Mar 01 '19 at 07:28
@FarazSiddique: Can you add your updated code to the question? — David, Mar 01 '19 at 11:37

How can i solve my this issue in MVC grid Delete Controller

1 Answers1