WPF Type initialization Exception in C#

Question

I have someone else\'s WPF-based .NET 3.5 app that I\'m attempting to update to .NET 4.5. The code ran fine under .NET 3.5, and I\'m running Visual Studio 2013 Express on Wi

Answer 1

<connectionStrings> tag should come after <configSections> and <startup> section. This made my code work.

Answer 2

I replaced the depreciated Configuration library and also removed entity framework so I can't track what's wrong at all, but rebuilding helped me. Solution to Rebuild your App.Config file.