public IActionResult Add(int Id, string Name)
{
var depart = context.Department
.Where(d => d.DepartmentId == Id)
.Select(d => new { DepartId = d.DepartmentId, DepartHier = d.Hierarchy, DepartParent = d.Parent }).FirstOrDefault();
var department = context.Set <Department>();
department.Add(new Department {
Name = Name, Hierarchy = depart.DepartHier + 1, Parent = depart.DepartId
});
context.SaveChanges();
return(RedirectToAction("Index", "Department"));
}