C# GridView分页无法正常工作

我正在尝试使用GridView进行分页， 我已经添加了GridView的PageIndexchange方法， 但是第二页返回一个空页。 这个代码我做错了什么

protected void GridView1_PageIndexChanging(object sender, GridViewPageEventArgs e)
{
    GridView1.PageIndex = e.NewPageIndex;
    GridView1.DataBind();
}

---

当我添加这个时，这个问题已经解决了

private void FillGrid()
{
    GridView1.DataSource = "Query..."
    GridView1.DataBind();
}

并改变了：

protected void GridView1_PageIndexChanging(object sender, GridViewPageEventArgs e)
{
    GridView1.PageIndex = e.NewPageIndex;
    FillGrid();
}

protected void Page_Load(object sender, EventArgs e)
{
    if (!IsPostBack)
    {
       BindGrid();
    }
}
private void BindGrid()
{
    GridView1.DataSource = "Query..."
    GridView1.DataBind();
}
protected void GridView1_PageIndexChanging(object sender,GridViewPageEventArgs e)
{
    GridView1.PageIndex = e.NewPageIndex;
    this.BindGrid();
}