private void fillProductDropDown(Int32 vendorID)
        {
            cbProductName.Items.Clear();
            List<VendorSourceItem> vendorSourceItemList = new List<VendorSourceItem>();
            VendorSourceItemManager _vendorSourceItemManager = new VendorSourceItemManager();
            vendorSourceItemList = _vendorSourceItemManager.GetVendorSourceItemsByVendor(vendorID);
            ProductManager _productManager = new ProductManager();

            foreach (VendorSourceItem v in vendorSourceItemList)
            {
                cbProductName.Items.Add(v.ProductID + " " + _productManager.GetProduct(v.ProductID).Name);
            }
        }