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<asp:UpdatePanel ID="udpanelImagesControl" runat="server" RenderMode="Inline" UpdateMode="Conditional">
<ContentTemplate>
<asp:Panel ID="panelUpImage" runat="server" Visible="false" Style="text-align: center;
width: 100%">
<asp:FileUpload ID="upLoadImage" runat="server" Width="336px" />
<asp:Button ID="btnUpload" runat="server" Text=" 上 传 " OnClick="btnUpload_Click" /></asp:Panel>
</ContentTemplate>
<Triggers>
<asp:AsyncPostBackTrigger ControlID="rbtnUploadImages" EventName="CheckedChanged" />
</Triggers>
</asp:UpdatePanel>
protected void rbtnUploadImages_CheckedChanged(object sender, EventArgs e)
{
this.panelUpImage.Visible = true;
}