In order for the .net runtime to read the changes that is made in the customization, it is necessary to reset the IIS, so the configuration files can be read again. This can be done in a few ways:

• Executing iisreset - Execute the command iisreset on the command prompt of the machine where the iis server is installed.
  
  
• Kill the aspnet_wp.exe - From the machine where the .Net runtime is installed, go to the task manager and kill the process called aspnet_wp.exe (or w3wp.exe).
  
  
• Edit web.config - Open the web.config file in edit mode, make a trivial change on it (e.g. add a empty line at the end) and then save it.
  Note: Before doing any edits on web.config, make a backup copy. Inconsistent changes in this file may result in destroying the consistency of the programs and data