在网上找的GridView自定义分页模板完整代码，修改了一下，还是有问题，请高手帮忙看看~！

protected void list_RowDataBound(object sender, GridViewRowEventArgs e)
    {
        if (e.Row.RowType == DataControlRowType.Pager)
        {            //显示记录数
            Label lblCurrentPage = (Label)(e.Row.FindControl("lblCurrentPage"));
            Label lblTotalPage = (Label)(e.Row.FindControl("lblTotalPage"));
            Label lblTotalCount = (Label)(e.Row.FindControl("lblTotalCount"));
            lblCurrentPage.Text = this.currentPage.ToString();
            lblTotalPage.Text = this.totalPage.ToString();
            lblTotalCount.Text = this.totalCount.ToString();
            //绑定分页按钮
            HyperLink linkFirst = (HyperLink)(e.Row.FindControl("linkFirst"));
            HyperLink linkPrev = (HyperLink)(e.Row.FindControl("linkPrev"));
            HyperLink linkNext = (HyperLink)(e.Row.FindControl("linkNext"));
            HyperLink linkLast = (HyperLink)(e.Row.FindControl("linkLast"));
            if (currentPage > 1)
            {
                hlFirst.NavigateUrl = "?id=1";
                hlPrevious.NavigateUrl = "?id=" + (this.currentPage - 1);
            }
            if (currentPage < totalPage)
            {
                hlNext.NavigateUrl = "?id=" + (this.currentPage + 1);
                hlLast.NavigateUrl = "?id=" + this.totalPage;
            }
            //绑定转到第几页
            DropDownList ddlRandom = (DropDownList)(e.Row.FindControl("ddlRandom"));
            for (int i = 1; i <= totalPage; i++)
            {
                ddlRandom.Items.Add(new ListItem(i.ToString(), i.ToString()));
            }
            ddlRandom.SelectedIndex = currentPage - 1;
        }
         if (e.Row.RowState == DataControlRowState.Normal)
         {
         }
}
    protected void gvFavorite_RowDeleting(object sender, GridViewDeleteEventArgs e)
    {
        string tempeteId = this.gvFavorite.DataKeys[e.RowIndex].Value.ToString();
        Favorites favorites = new Favorites();
        bool flag = favorites.DeleteFavorite(tempeteId);
        if (flag)
        {
            Response.Write("<script lauguage='javascript'> alert('你已经成功删除了一条模板')</script>");
        }        else
        {
            Response.Write("<script lauguage='javascript'> alert('删除失败')</script>");
        }
        this.BindGvFavorite();    }
    protected void ddlRandom_SelectedIndexChanged(object sender, EventArgs e)
    {
        GridViewRow gvr = this.list.BottomPagerRow;
        DropDownList ddlRandom = (DropDownList)(gvr.FindControl("ddlRandom"));
        this.currentPage = Convert.ToInt32(ddlRandom.SelectedIndex.ToString()) + 1;
        Response.Redirect("?id=" + this.currentPage);    }错误如下：
编译错误 
说明: 在编译向该请求提供服务所需资源的过程中出现错误。请检查下列特定错误详细信息并适当地修改源代码。 编译器错误信息: CS0117: “Admin_News”并不包含“currentPage”的定义源错误: 行 21:             Label lblTotalPage = (Label)(e.Row.FindControl("lblTotalPage"));
行 22:             Label lblTotalCount = (Label)(e.Row.FindControl("lblTotalCount"));
行 23:             lblCurrentPage.Text = this.currentPage.ToString();
行 24:             lblTotalPage.Text = this.totalPage.ToString();
行 25:             lblTotalCount.Text = this.totalCount.ToString();