title: How to change the content of my app.config after installation of the application
body: <p>I am working on WPF application that soon has to be ready for installation but there is a functionallity that allows the user to make changes to the app.config file and I don't know how to do that from the code-behind of the application.Also I don't know how this is going to work after the installation of the app.</p>
  
  <p>Simply said: I have a window that allows the user to enter a text that is going to be searched for in the web.config of another application.So in my app.config I have a different searches and I want after the installation the user to be able (after entering values in the window's textoxes) enter new values in the app.config of the application.</p>
  
  <p>Can somebody tell if that is possible and eventually how I could achieve this?</p>