//Display the all of the product in the cart and the toal cost
public void showCart(double totalcost)
{
String sql = "SELECT cart FROM TP_Customer WHERE customer_id = '" + Session["customerID"].ToString() + "'";
objDB.GetDataSet(sql);
//if (objDB.GetField("cart", 0) != System.DBNull.Value)
//{
// // De-serialize the binary data to reconstruct the CreditCard object retrieved
// // from the database
// Byte[] byteArray = (Byte[])objDB.GetField("cart", 0);
// BinaryFormatter deSerializer = new BinaryFormatter();
// MemoryStream memStream = new MemoryStream(byteArray);
// Product product = (Product)deSerializer.Deserialize(memStream);
// productlist = (ArrayList)Session["Productlist"];
// productlist.Add(product);
// gvCart.DataSource = productlist;
// gvCart.DataBind();
//}
//else if (objDB.GetField("cart", 0) == System.DBNull.Value)
//{
//}
gvCart.Columns[0].FooterText = "Total";
gvCart.Columns[4].FooterText = totalcost.ToString("C2");
productlist = (ArrayList)Session["Productlist"];
gvCart.DataSource = productlist;
String[] productid = new string[1];
productid[0] = "product_id";
gvCart.DataKeyNames = productid;
gvCart.DataBind();
}