Problem in deleting a file in App_Themes folder

[rahuldhammy]

I am implementing a personalization (customizing the contents of the web site according to the user choice)in asp.net web site.For this i have to delete modify some files in my App_Themes folder.I am trying to do this with my c# code.But i always get some exception while deleting the files from the App-Themes folder.Even if the files are deleted it gives the call to Application_Sta rt in global.asax.It seems application restarts if any change is made in the App_Themes folder.So please tell me the solution for this i want to delete the files from the App_themes folder without restarting the application.

Thanks in advance.