title: Why do script blocks grow endlessly in VS2010 Debugger when running ASP.Net page with partial postbacks?
body: <p>On an ASP.Net page that uses an UpdatePanel containing various validated controls for partial postbacks, the Visual Studio 2010 script debugger window starts to show an ever growing list of "Script Block" entries which appear to be anonymous our auto-generated functions related to the controls on the panel as it is reloaded. It appears that old script blocks from previous times the panel was updated are not disposed so the list just keeps on growing, slowing down the page and the debugger, until IE is closed whereupon it can take a long time to delete the hundreds of blocks that have appeared.</p>
  
  <p>Is this a problem with the way the page is operating or an artifact of the debugger? Comparing performance of the debugged and non-debugged page it appears to be the latter, but it would be good to know what is going on and why.</p>