Value cannot be null. Parameter name: items (in Dropdown List) ASP.NET MVC5

Question

I have problem in my code. I\'m using the registration form which comes with MVC5 , I added a field \"Role\" as a Dropdownlist to assign a role to the user while creating a

Answer 1

Personally I would create the select list in your controller and pass it to the model, writing something like

  var RolesList = new List
            {
                new SelectListItem { Value = string.Empty, Text = "Please select a Role..." }
            };

   RolesList.AddRange(roles.Select(t => new SelectListItem
            {
                Text = t.role,
                Value = t.Id.ToString()
            }));` 

and then add this to your model, in your model you can then use

@Html.DropDownListFor(m => m.Role, Model.RoleList, new { @class = "form-control" })

This method/syntax works for me I am not sure if It is 'best practice' though