给GridView分页

private void Bind()
    {
        GV1.DataSource = newsbll.SelectNews();
        GV1.DataBind();
        //分页
        int pageAll = Convert.ToInt32(GV1.PageCount.ToString());
        this.LblCurrentIndex.Text = "第 " + (GV1.PageIndex + 1).ToString() + " 页";
        this.LblPageCount.Text = "共 " + pageAll + " 页";
        // 计算生成分页页码,分别为："首页" "上一页" "下一页" "尾页"
        btnFirst.CommandName = "1";
        btnPrev.CommandName = (GV1.PageIndex == 0 ? "1" : GV1.PageIndex.ToString());
        btnNext.CommandName = (GV1.PageCount == 1 ? pageAll.ToString() : (GV1.PageIndex + 2).ToString());
        btnLast.CommandName = pageAll.ToString();
        ddlpage.Items.Clear();
        if (pageAll > 1)
        {
            for (int i = 1; i <= pageAll; i++)
            {
                ddlpage.Items.Add(new ListItem("" + i, "" + i));
            }
            ddlpage.Items.FindByValue((GV1.PageIndex + 1).ToString()).Selected = true;
            ddlpage.Visible = true;
            noinfodiv.Visible = false;
            pagediv.Visible = true;
        }
        else if (pageAll == 1)
        {
            pagediv.Visible = false;
            noinfodiv.Visible = false;
        }
        else
        {
            pagediv.Visible = false;
            noinfodiv.Visible = true;
        }
    }

/// <summary>
    /// 分页上一页下一页首页尾页
    /// </summary>
    /// <param name="sender"></param>
    /// <param name="e"></param>
    protected void PagerButtonClick(object sender, EventArgs e)
    {
        GV1.PageIndex = Convert.ToInt32(((LinkButton)sender).CommandName) - 1;

Bind();

    }
    /// <summary>
    /// 转页面dorpListDown
    /// </summary>
    /// <param name="sender"></param>
    /// <param name="e"></param>
    protected void ddlpage_SelectedIndexChanged(object sender, EventArgs e)
    {
        GV1.PageIndex = Convert.ToInt32(ddlpage.SelectedValue) - 1;
        ddlpage.SelectedIndex = GV1.PageIndex;
        Bind();
    }