关于GridView绑定控件的问题

Question

绑定GridView代码如下：private void BindData()
    {
        XmlTextReader XTR = new XmlTextReader(Server.MapPath("Grade.xml"));
        DataSet ds = new DataSet();
        ds.ReadXml(XTR);
        GridView1.DataSource = ds.Tables[0].DefaultView;
        GridView1.DataBind();
        XTR.Close();
    }protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
    {
        if (e.Row.RowType == DataControlRowType.DataRow)
        {
            if (e.Row.RowIndex == GridView1.EditIndex)
            {
                   System.Data.DataRowView drv = (System.Data.DataRowView)e.Row.DataItem
                   //上面这行代码是数据自定义视图,测试过后出问题了,看来这个不适合以XML为数据源的GridView,那么
                        我该如何修改上面的代码才能成功呢？
            }
        }
    }