asp.net - I am unable to use FileUpload which is in Gridview in the UpdatePanel, have also used trigger, how can i solve this? -

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i want use updatepanel gridview, fileupload in gridview doesn't work if added trigger... because cant find fileupload button, whats solution?

<asp:templatefield headertext="upload kundli">   <itemtemplate>     <asp:fileupload id="fileupload1" runat="server" /><br />     <asp:button id="btnupload" runat="server" text="upload" onclick="btnupload_click" />   </itemtemplate>   <itemstyle horizontalalign="center" />   <headerstyle horizontalalign="center" /> </asp:templatefield>  </columns>  </asp:gridview>  </contenttemplate> <triggers>   <asp:postbacktrigger controlid="btnupload" /> </triggers> </asp:updatepanel>

here way via code behind, dummy mockup give idea:

aspx code:

<form id="form1" runat="server"> <asp:scriptmanager id="scriptmanager1" runat="server">             </asp:scriptmanager>    <asp:updatepanel runat="server"> <contenttemplate>     <asp:label runat="server" id="label1" text=""></asp:label>     <asp:gridview runat="server" id="gridview1" onrowdatabound="gridview1_rowdatabound">     <columns>     <asp:templatefield headertext="upload kundli">                                 <itemtemplate>                                     <asp:fileupload id="fileupload1" runat="server" /><br />                                     <asp:button id="btnupload" runat="server" text="upload"       onclick="btnupload_click" />                                 </itemtemplate>                                  <itemstyle horizontalalign="center" />                                 <headerstyle horizontalalign="center" />                             </asp:templatefield>            </columns>      </asp:gridview>      </contenttemplate>          </asp:updatepanel>         </form>

code behind (aspx.cs):

protected void page_load(object sender, eventargs e)         {             if (!ispostback)             {                 list<int> griditems = new list<int>();                 griditems.add(1);                 griditems.add(2);                 gridview1.datasource = griditems;                 gridview1.databind();             }         }          protected void gridview1_rowdatabound(object sender, gridviewroweventargs e)         {             //may not need if. check depending on , how binding.             if (e.row.rowtype == datacontrolrowtype.datarow)             {                 button uploadbuton = (button) e.row.cells[0].findcontrol("btnupload");                 if(uploadbuton != null)                 {                     if (this.scriptmanager1 != null)                     {                         this.scriptmanager1.                             registerasyncpostbackcontrol(uploadbuton);                     }                 }              }          }         protected void btnupload_click(object sender, eventargs e)         {             label1.text = label1.text + "a";         }

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