Under some scenarios, developers want to encrypt some sections inside app.config or web.config file. This article How To: Encrypt Configuration Sections in ASP.NET 2.0 Using RSA describes how to do so clearly, Scott Guthrie also posted one: Encrypting Web.Config Values in ASP.NET 2.0.
However, in the posts above, they use aspnet_regiis.exe and it seems it doesn’t directly support app.config, if we want to encrypt app.config for Windows Form or WPF applications While I tried use it to encrypt my app.config file, it generates a web.config which means my Winform definitely can’t use it, even if I copy the encrypted
appSettings section from this generated web.config to my own app.config (
null after I did that).
After several minutes of Google search and testing, I found the code below is simple and very straight forward to achieve this:
Configuration config = ConfigurationManager.OpenExeConfiguration(
SectionInformation appSettingsSecInfo = config.GetSection(
Console.WriteLine("The configuration file has NOT been protected!");
appSettingsSecInfo.ForceSave = true;
This code snippet will do the encryption job and works for both app.config/web.config. Here is the MSDN definition page for