How to Encrypt a section in web.config

To Encrypt on IIS

aspnet_regiis.exe -pe "[Section To Encrypt]" -app "/[Virtual Directory on IIS]"

eg---

aspnet_regiis.exe -pe "connectionStrings" -app "/vitualdirectory"

To decrypt on IIS 

aspnet_regiis.exe -de "[Section To Encrypt]" -app "/[Virtual Directory on IIS]"

eg---

aspnet_regiis.exe -de "connectionStrings" -app "/vitualdirectory"