protected void lbAddToCart_Click(object sender, EventArgs e)
        {
            string response = "";

            response = cart.AddItemInCart(Convert.ToInt32(Session["ProductId"]));
            if (response == "Already")
            {
                ScriptManager.RegisterStartupScript(this.Page, Page.GetType(), "text", "showAlert('Error!','Product is already added.')", true);
            }
            else
            {
                ScriptManager.RegisterStartupScript(this.Page, Page.GetType(), "text", "showAlert('Success','Product is added.')", true);
                this.Master.NoOfProducts = cart.Count.ToString();
            }
        }