private void btnAddSuppProd_Click(object sender, EventArgs e)
        {
            Products_Suppliers prodSupp = new Products_Suppliers();

            prodSupp.ProductId  = Convert.ToInt32(cbProductforCombination.SelectedValue);
            prodSupp.SupplierId = Convert.ToInt32(cbSupplierIDForCombined.SelectedValue);
            Products_SuppliersDB.AddProductsSuppliers(prodSupp);
            lblAddSuppProd.Text             = "Supplier/Product Combo has been added";
            supplierDataGridView.DataSource = SupplierDB.GetSuppliers();
        }