MasterPage.master.cs

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

public partial class MasterPage : System.Web.UI.MasterPage
{
    public int shuliang;
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            shoppingcart car = new shoppingcart();
            if (Session["car"] != null)
            {
                car = (shoppingcart)Session["car"];
                 shuliang = car.orders.Count;
            }

        }
       
    }
    protected void Button1_Click(object sender, EventArgs e)
    {
        if (key.Text == "请输入关键字")
        {
            Page.ClientScript.RegisterStartupScript(this.GetType(), "alert", "<script>alert('关键字不能为空！');</script>");
            return;
        }

        Response.Redirect("ProductList.aspx?k=" + Server.UrlEncode(key.Text));
    }
}