How to force button do a full postback instead of asynchronous postback

Anonymous User 2264 28 Aug 2014

In an ASP.NET 4.0 web application, I have a user control that is wrapped by an UpdatePanel

<asp:UpdatePanel ID="UpdatePanel5" runat="server" UpdateMode="Conditional">

<UC:MyCustomCtrl ID="customCtrl" runat="server" />

</ContentTemplate>

</asp:UpdatePanel>

I have an ASP.NET button in the user control that makes an asychronous request to the server

The server then creates an Excel spreadsheet and then places the spreadsheet in the HttpResponse to send back to the client's browser so they can open/save it.

However, it blows up at this point because the request to the server is asynchronous and apparently you can't put a binary in the HttpResponse during an asynchronous request.

How do I get around this?

Ask by Anonymous User

Updated 28 Aug 2014

1 Answers

Sumit Kesarwani 28 Aug 2014

Hi Ankita,

you can add triggers to UpdatePanels that allow full post back. here's an example

<asp:UpdatePanel ID="UpdatePanel5" runat="server" UpdateMode="Conditional">
   
<ContentTemplate>
       
<UC:MyCustomCtrl ID="customCtrl" runat="server"/>
   
</ContentTemplate>
    <Triggers>
       
<asp:PostBackTrigger ControlID="btnID" />
    </Triggers>
</asp:UpdatePanel>

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How to force button do a full postback instead of asynchronous postback

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