encyption/decryption of connection string..

I have requirement to encrypt the windows service config file and web.config connection strings, I could able to do that for web.config with aspnet_regiis (C:\Windows\Microsoft.NET\Framework64\v2.0.50727>aspnet_regiis -pe "connectionStrings" -app "/application.ui")
But I am still looking similar kind of way for windows service config file to encrypt and decrypt.
 
.exe.config file snippet as below
 
<?xml version="1.0" encoding="utf-8" ?>
<configuration>
  <configSections>
  <sectionGroup >
    <section requirePermission="false" />
 </sectionGroup>
  </configSections>
  <connectionStrings>
   
  </connectionStrings>
  <appSettings>
 
Is there any utility ...