ASP.NET Standard Edit Controller

gistfile1.cs

// GET: /Department/Edit/5
public ActionResult Edit(int? id)
{
    if (id == null)
    {
        return new HttpStatusCodeResult(HttpStatusCode.BadRequest);
    }
    Department department = _context.Departments.Find(id);
    if (department == null)
    {
        return HttpNotFound();
    }
    return View(department);
}