在.NET中以编程方式添加应用程序密钥时，如何在配置文件中写入空行？

I am writing an app key to an App.Config file programatically using code like below, but I also want to add a blank line for readability inside the App.Config file after writing/saving the key. Is this possible? If so, how? I could not find an answer.I am writing an app key to an App.Config file p