Just introducing a web site and a windows application, they will help you to create C# class from JSON response.
Just open the website http://json2csharp.com/ paste the JSON text (or you can use the URL of the JSON) and click Generate. The class or Classes will be generated based on the text.
jsonclassgenerator is an open source windows application which also does the same. It have some more features. The screenshot of the application is at the top of this page. You can get it from https://archive.codeplex.com/?p=jsonclassgenerator or from gitHub https://github.com/antiufo/json-class-generator (It currently supports typed arrays, typed objects, integers, floats, booleans, strings and nullable types.)