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Button btn=(Button)sender;
HiddenField f1=(HiddenField)btn.FindControl("HiddenField1");
<asp:DataList ID="DataList1" runat="server" Width="1310px"
style="border:1px #000 solid" onitemcommand="DataList1_ItemCommand" >
<ItemStyle/>
<HeaderTemplate>
<table border="0" cellpadding="1" cellspacing="1">
<tr>
<td align="center">姓名</td>
<td align="center">修改</td>
<td align="center">删除</td>
</tr>
</HeaderTemplate>
<ItemTemplate>
<tr>
<td align="center"><%# Eval("User_Name") %></td>
<td align="center"><asp:Button CssClass="btn1" ID="btnUpdate" runat="server" Text="修改" /> </td>
<td align="center"><asp:Button CssClass="btn1" ID="btnDel" runat="server" Text="删除"
onclick="btnDel_Click" CommandName="btnCN" /> </td>
<td><asp:HiddenField ID="HiddenField1" runat="server" Value='<%# Eval("id") %>' /></td>
</tr>
</ItemTemplate>
<FooterTemplate>
</table>
</FooterTemplate>
</asp:DataList>
protected void btnDel_Click(object sender, EventArgs e)
{
foreach (DataListItem item in DataList1.Items)
{
HiddenField tmp_hidden = (HiddenField)item.FindControl("HiddenField1");
int q =int.Parse(tmp_hidden.Value);
}
}