private void GetPlaneByPlaneType(string planeType) { try { List <Plane> planes = _planeService.GetPlanesByPlaneType(planeType); planes.Insert(0, new Plane() { PlaneName = "Select Planes" }); ddlPlaneName.DataSource = planes; ddlPlaneName.DisplayMember = "PlaneName"; ddlPlaneName.ValueMember = "Id"; } catch (Exception) { throw; } }