ModelState isvalid return false when id / key = 0

Question

ModelState Isvalid is returning false when Primary Key is 0 on Creation.

In model:

[Key]
        public int CourseId { get; set; }

In database:

database data:

In View:

Value is 0:

ModelState IsValid return false:

Any idea why is it invalid?

Answer 1

Try this approach. Don't return a null value and instead return a new instance of Course

  public ViewResult AddCourse(int id)
  {
        var course = yourservice.GetById(id);

        if(customer == null)
        {
            course = new Course();
        }
        return View(course);
    }
 }