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<asp:UpdatePanel ID="UpdatePanel1" runat="server">
<ContentTemplate>
<asp:FileUpload ID="fu_file" runat="server" Width="400px" size="46" />
<asp:Button ID="btn_Up" runat="server" Height="24px" Text="上传" Width="104px" OnClick="btn_Up_Click" />
</ContentTemplate>
<Triggers>
<asp:PostBackTrigger ControlID="btn_Up" />
</Triggers>
</asp:UpdatePanel>