In this article I am going to show how we can update a key value in app.config file in WPF. For this add reference of System.Configuration in your application.
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This sounds like a deep technical thing and internally it's right too. But in a developer prospective, if he needs to run an assembly under a fresh new ApplicationDomain, it's so easy like just use some of the classes defined in System NameSpace. Below I am explaining this with a small console application.