public ActionResult Edit(int id = 0)
{
return id == 0 ? null : View(studmods.Edit(id));
}
You can give an optional parameter of = 0
https://docs.microsoft.com/en-us/dotnet/csharp/programming-guide/classes-and-structs/named-and-optional-arguments
https://docs.microsoft.com/en-us/dotnet/csharp/language-reference/operators/conditional-operator
MVC issues can be discussed at the ASP.NET forums.
https://forums.asp.net/