private void PopulateOpCoDeliveryWarehouses(string opCo)
{
// Populate the delivery warehouses for OpCo Shipment option
ddlDeliveryWarehouse.DataSource = WarehouseController.GetOpCoDeliveryWarehouseCodes(opCo);
ddlDeliveryWarehouse.Items.Clear();
ddlDeliveryWarehouse.Items.Add(new ListItem("All", "-1"));
ddlDeliveryWarehouse.DataBind();
}