Encrypt App.config

// Run "Encryption.EncryptConnectionStrings();" in the beginning of your winservice or winforms app.
// You need to add .NET reference to System.configuration.dll
using System.Configuration;
public static class Encryption
{
public static void EncryptConnectionStrings()
{
Configuration configuration = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);
ConfigurationSection section = configuration.GetSection("connectionStrings");
if (!section.SectionInformation.IsProtected)
{
section.SectionInformation.ProtectSection("DataProtectionConfigurationProvider");
section.SectionInformation.ForceSave = true;
configuration.Save(ConfigurationSaveMode.Modified);
}
}

public static void DecryptConnectionStrings()
{
Configuration configuration = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);
ConfigurationSection section = configuration.GetSection("connectionStrings");
if (section.SectionInformation.IsProtected)
{
section.SectionInformation.UnprotectSection();
section.SectionInformation.ForceSave = true;
configuration.Save(ConfigurationSaveMode.Modified);
}
}
}