When adding an UpdateProgress area to an ASP.NET form you will receive constanterrors unless EnablePartialRendering is set to TRUE for the ScriptManager in yourpage.
See screenshots below for the error and the entry in the aspx page…
Do you have Firefox or any other browser other than IE installed and each time yourun a debug for an ASP.NET site that browser opens instead of IE? Or wouldyou rather that browser open and not IE?
You can easily set the browser that Visual Studio uses to browse with by followingthese steps:
1) In your web application right click any ASP.NET file in the Solution Explorer
2) Left click “Browse with…”
3) You will be presented with a list of browsers. Here you can select one and clickthe “Set Default” button to set the default for Visual Studio OR you can click the”Browse” button to view this page in the browser you have selected.
See screenshots below:
