asp.net - How to use Fileupload control in UpdatePanel? -

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i have fileupload, image control , button control. using updatepanel : when click button after chosing image, image control should show image without postback. not work?

<asp:scriptmanager id="scriptmanager1" runat="server"></asp:scriptmanager> <asp:updatepanel id="updatepanel1" runat="server">     <contenttemplate>         <asp:fileupload id="fileupload1" runat="server" />         <br />         <asp:image id="image1" runat="server" />     </contenttemplate>     <triggers>         <asp:asyncpostbacktrigger controlid="button1" />     </triggers> </asp:updatepanel> <asp:button id="button1" runat="server" text="button" onclick="button1_click" />

my code behind just:

protected void button1_click(object sender, eventargs e) {     if (fileupload1.hasfile) {         fileupload1.saveas(server.mappath("~/") + fileupload1.postedfile.filename);         image1.imageurl = "~/" + fileupload1.postedfile.filename;     } }

how can ?


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