public void Add()
 {
     DepartmentId = -1;
     try
     {
         Departments dep = new Departments();
         dep.DepartmentName = DepartmentName;
         DepartmentId       = _model.ADD(dep);
     }
     catch (Exception ex)
     {
         DepartmentName = "not found";
         Console.WriteLine("Problem in " + GetType().Name + " " + MethodBase.GetCurrentMethod().Name + " " + ex.Message);
         throw ex;
     }
 }