upload file not working in updatepanel

Question

I DONT WANNA GET MY PAGE TO BE GET REFRESH OR POSTBACK

So I am trying uploading file in updatepanel but onclicking upload button the valida

Answer 1

Write trigger will instruct the button that we are using for the upload to perform a full postback

<asp:UpdatePanel ID="UpdatePanel16" runat="server">
<Triggers>
    <asp:PostBackTrigger ControlID="btn_browse" />
       </Triggers>
<ContentTemplate>
 <asp:FileUpload ID="fp_upload" runat="server" />&nbsp;&nbsp;
<asp:Button ID="btn_browse" runat="server" Text="Upload" OnClick="btn_browse_Click" />
    </ContentTemplate>  
    </asp:UpdatePanel>

Answer 2

just add PostBackTrigger after </ContentTemplate> for the FileUploader as below:

 </ContentTemplate>
      <Triggers>
      <asp:PostBackTrigger ControlID="FileUpload1" /> 
     </Triggers>
 </asp:UpdatePanel> 

and add the below code in page load :

ScriptManager.GetCurrent(this).RegisterPostBackControl(FileUpload1);  

or if you want to make it async, you can use this :

<asp:ScriptManager ID="ScriptManager1" runat="server" />
<asp:UpdatePanel ID="UpdatePanel1" runat="server">
    <ContentTemplate>
        <asp:FileUpload ID="FileUpload1" runat="server" />
        <asp:Button ID="btnAsyncUpload" runat="server"
           Text="Async_Upload" OnClick = "Async_Upload_File" />
        <asp:Button ID="btnUpload" runat="server" Text="Upload"
           OnClick = "Upload_File" />               
    </ContentTemplate>
    <Triggers>
        <asp:AsyncPostBackTrigger ControlID = "btnAsyncUpload"
          EventName = "Click" />
        <asp:PostBackTrigger ControlID = "btnUpload" />
    </Triggers>
</asp:UpdatePanel>

Answer 3

To use a FileUpload control inside an UpdatePanel control, set the postback control that submits the file to be a PostBackTrigger control for the panel.