IIS Express Access denied

Solutions:

1. Put a specific location for google_com.txt file. like C:\google_com.txt. Actually it is not allowing to create the file in default location(inside program files) as it might not have the proper privilege.
   
2. If you want to create the file in default location(inside program files) run Visual Studio as Administrator.(R-Click-> Run as Administrator).

Run Visual Studio as Administrator

You can't write to the Program Files folders on Windows Vista or later unless you're running elevated/as an administrator.

You should be writing to the application's App_Data folder if you need to write anywhere. Look into using Server.MapPath().