C#中DataGrid加载XML数据--在另外一页面修改数据

private void Page_Load(object sender, System.EventArgs e)
{
// 在此处放置用户代码以初始化页面
if(!IsPostBack)
{
lblID.Text = Request.QueryString["ID"].ToString();
InitData();//根据传过来的ID来得到相应的值
}
}

#region 根据传过来的ID来得到相应的值
private void InitData()
{
string path = Server.MapPath("Zph.xml");
XmlDocument xdoc = new XmlDocument();
xdoc.Load(path);
for(int i=0; i<xdoc.DocumentElement.ChildNodes.Count; i++)
{
if(lblID.Text == xdoc.DocumentElement.ChildNodes[i].ChildNodes[0].InnerText)
{
this.txtZphID.Text = xdoc.DocumentElement.ChildNodes[i].ChildNodes[1].InnerText;
this.txtTitle.Text = xdoc.DocumentElement.ChildNodes[i].ChildNodes[2].InnerText;
this.txtContent.Text = xdoc.DocumentElement.ChildNodes[i].ChildNodes[3].InnerText;
this.txtDate.Text = xdoc.DocumentElement.ChildNodes[i].ChildNodes[4].InnerText;
this.txtTime.Text = xdoc.DocumentElement.ChildNodes[i].ChildNodes[5].InnerText;
this.txtNum.Text = xdoc.DocumentElement.ChildNodes[i].ChildNodes[6].InnerText ;
this.txtPlace.Text = xdoc.DocumentElement.ChildNodes[i].ChildNodes[7].InnerText;
}
}
}
#endregion

private void btnEdit_Click(object sender, System.EventArgs e)
{
string path = Server.MapPath("Zph.xml");
XmlDocument xdoc = new XmlDataDocument();
xdoc.Load(path);
for(int i= 0 ; i<xdoc.DocumentElement.ChildNodes.Count;i++)
{
if(lblID.Text == xdoc.DocumentElement.ChildNodes[i].ChildNodes[0].InnerText)
{
xdoc.DocumentElement.ChildNodes[i].ChildNodes[1].InnerText = this.txtZphID.Text ;
xdoc.DocumentElement.ChildNodes[i].ChildNodes[2].InnerText = this.txtTitle.Text;
xdoc.DocumentElement.ChildNodes[i].ChildNodes[3].InnerText = this.txtContent.Text;
xdoc.DocumentElement.ChildNodes[i].ChildNodes[4].InnerText = this.txtDate.Text;
xdoc.DocumentElement.ChildNodes[i].ChildNodes[5].InnerText = this.txtTime.Text;
xdoc.DocumentElement.ChildNodes[i].ChildNodes[6].InnerText = this.txtNum.Text;
xdoc.DocumentElement.ChildNodes[i].ChildNodes[7].InnerText = this.txtPlace.Text;
}
}
xdoc.Save(path);
// Response.Redirect("Index.aspx");
Response.Write("<script>alert('修改成功!');window.location.href='Index.aspx'</script>");
}

private void btnCancel_Click(object sender, System.EventArgs e)
{
InitData();
}