一次更新Datagrid中多列数据

为了方便演示用xml文件做为数据源

xml文件：（UserInfo.xml）

<?xml version="1.0" standalone="yes"?>

<UserInfos>

<UserInfo>

<Email>some@you.net</Email>

<Name>me</Name>

<TEL>0123456</TEL>

</UserInfo>

<UserInfo>

<Email>youraddress@you.com</Email>

<Name>he</Name>

<TEL>7894563</TEL>

</UserInfo>

<UserInfo>

<Email>youraddress@you.com</Email>

<Name>222</Name>

<TEL>123342</TEL>

</UserInfo>

<UserInfo>

<Email>youraddress@you.com</Email>

<Name>haha</Name>

<TEL>3545445</TEL>

</UserInfo>

<UserInfo>

<Email>youraddress@you.com</Email>

<Name>sam</Name>

<TEL>879563</TEL>

</UserInfo>

</UserInfos>

页面代码：

<form id="Form1" method="post" runat="server">

<asp:DataGrid id="DGrid" runat="server" ShowFooter="True" GridLines="None" CellPadding="2" AutoGenerateColumns="False">

<HeaderStyle Font-Bold="True"></HeaderStyle>

<Columns>

<asp:TemplateColumn HeaderText="名字">

<ItemTemplate>

<asp:TextBox id=Name runat="server" Width="109px" Text='<%# DataBinder.Eval(Container, "DataItem.Name") %>'>

</asp:TextBox>

</ItemTemplate>

<FooterTemplate>

<asp:TextBox id="NewName" runat="server" Width="109px"></asp:TextBox>

</FooterTemplate>

</asp:TemplateColumn>

<asp:TemplateColumn HeaderText="电话">

<ItemTemplate>

<asp:TextBox id=TEL runat="server" Width="109px" Text='<%# DataBinder.Eval(Container, "DataItem.TEL") %>'>

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