c# - Issue when trying to download file using Update Panel -


i checked browser isn't blocking popups seem have error in code can't seem figure out whats problem

    protected void btndownload_click(object sender, eventargs e)     {         var context = new hmanginternationalcontext("hmanginternational");         var id = convert.toint32((sender button).commandargument);         var song = context.albumentries.where(x => x.id == id).firstordefault();         if (song != null)         {             response.clear();             response.addheader("content-type", "application/octet-stream");             response.addheader("content-disposition", "attachment;filename=" + httputility.urlencode(song.filename));             response.binarywrite(song.data);             response.end();             udpfiles.update();         }     }

i tried version size included didn't work either, silent discard, maybe see error in code ?

here asp.net code (this works)

<asp:updatepanel runat="server" id="udpfiles">     <triggers>         <asp:postbacktrigger controlid="gdvsongs" />     </triggers>     <contenttemplate>         <h1 class="hmang-page-header">tracks<asp:button runat="server" text="add new track" onclientclick="show();" id="btnadd" visible="false" class="btn btn-primary set-right"></asp:button></h1>         <asp:gridview id="gdvsongs" runat="server" autogeneratecolumns="false" cssclass="table table-dark table-condensed table-bordered">             <columns>                 <asp:templatefield>                     <headertemplate>                         track name                     </headertemplate>                     <itemtemplate>                         <%# eval("name") %>                     </itemtemplate>                 </asp:templatefield>                 <asp:templatefield>                     <headertemplate>                         file                     </headertemplate>                     <itemtemplate>                         <%# eval("filename") %>                     </itemtemplate>                 </asp:templatefield>                 <asp:templatefield>                     <itemtemplate>                         <asp:button text="download" runat="server" cssclass="btn btn-primary" id="btndownload" commandargument='<%# eval("id") %>' onclick="btndownload_click" />                     </itemtemplate>                 </asp:templatefield>             </columns>         </asp:gridview>     </contenttemplate> </asp:updatepanel>

an educated guess: happens inside update panel, doesn't it?

this happened me once, reason no error/exception thrown nothing wrong in end. file data goes front-end, rejects render content of update panel.

if that's case, have put control fires postback (i.e. btndownload )as sync trigger of update panel:

<triggers>         <asp:postbacktrigger controlid="gdvsongs" /> </triggers>

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