protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            BindList((int)Request["Page"]);  //Page为页码参数

        }
    }

    /// <summary>
    /// 搜索
    /// </summary>
    /// <param name="sender"></param>
    /// <param name="e"></param>
    protected void btnSearch_Click(object sender, EventArgs e)
    {
        BindList(1);  //搜索是为第一页
    }

    /// <summary>
    /// 绑定数据
    /// </summary>
    private void BindList(int pageIndex)
    {
        if (pageIndex < 1)
            pageIndex = 1;
         
        //绑定数据代码
         ...
    }