How to fix error: The message received from the server could not be parsed

Question

We have a Sharepoint solution that uses AJAX. The button that triggers this is inside an update panel.

One of the things that we do is generate a MS Word document, t

Answer 1

On your button click, redirect to another page that can stream any files that you might want to do this type of thing with. We use a document.aspx page in many of our sites and then pass a document id via querystring and stream the file from there.

In your example, you're basically trying to change the headers for a page that's already been displayed which isn't allowed

Answer 2

Keep your button outside the update panel. Then it works fine.

Answer 3

Set your button to cause full postback like this:

 <Triggers>
<asp:PostBackTrigger ControlID="PrintButton" />
</Triggers>

Answer 4

The action that causes this code to execute MUST be a postback event, and not an AJAX call.

This is due to the nature of the way AJAX requests are processed.