protected void LoadVehicleTypes() { DataTable vTypeDataTable = VehicleBLL.vehicleGetTypeBrandMake(Int32.Parse(uoDropDownListVehicleBranch.SelectedValue)); ListItem item = new ListItem("--Select Vehicle Type--", "0"); uoDropDownListVehicleType.Items.Clear(); uoDropDownListVehicleType.Items.Add(item); uoDropDownListVehicleType.DataSource = vTypeDataTable; uoDropDownListVehicleType.DataTextField = "vehicleType"; uoDropDownListVehicleType.DataValueField = "colVehicleIdBigint"; uoDropDownListVehicleType.DataBind(); ViewState["vTypeDataTable"] = vTypeDataTable; }