Write in app.config in .Net 3.5?

Question

Do I need to write an app.config file in my .NET 3.5 Windows application in order to save some system settings?

I can read from a file, but I can not write to it ??

All I found is for 2.0 and it doesn't look like it's equal to 3.5.

Answer 1

.NET 2.0 is part of .NET 3.5

So just use what you found for .NET 2.0, or look at: Read / write App.config with .NET 2.0

Also see SO answer: Update app.config system.net parameter at runtime