I have implemented AJAX update panel on my SharePoint visual web part. The web part contains a few buttons and a grid surrounded by update panel.
It is working fine but when I stay idle for some time and click a button within the update panel, the complete page refreshes and it throws a complete post back. This does not happen always. This situation arises when there is an idle time. After that, when I click a button, the post back occurs.
Any idea on why it is happening?