public void BinddropdownWareHouse() { DataTable dt = new DataTable(); dt = ddo.GetValueWareHouse(); dropdownWareHouse.DataSource = dt; dropdownWareHouse.DataTextField = "WareHouseName"; dropdownWareHouse.DataValueField = "WareHouseId"; dropdownWareHouse.DataBind(); dropdownWareHouse.Items.Insert(0, new ListItem { Text = "--Choose-WareHouse--", Value = " " }); }