title: Modifying app.config file with Visual Studio Extension
body: <p>I am trying to create a Visual Studio Extension (either Add-In or VSPackage) that will do the following:</p>
  
  <p>1) Find all selected projects in the current solution.
  2) Obtain access to each project's app.config or web.config file and modify it.</p>
  
  <p>I have been able to figure out step 1 for both an Add-In and a VSPackage. I haven't managed to figure out a way to do step 2). Does anyone have pointers to a blog / documentation that can help me complete step 2) ? </p>
  
  <p>Also, which extensibility option would you recommend for such a project? An Add-In or a VSPackage?</p>
  
  <p>Thanks,</p>
  
  <p>armahg</p>