How to auto-generate a C# class file from a JSON string
Five options:
Use the free jsonutils web tool without installing anything.
If you have Web Essentials in Visual Studio, use Edit > Paste special > paste JSON as class.
Use the free jsonclassgenerator.exe
The web tool app.quicktype.io does not require installing anything.
The web tool json2csharp also does not require installing anything.
Pros and Cons:
jsonclassgenerator converts to PascalCase but the others do not.
app.quicktype.io has some logic to recognize dictionaries and handle JSON properties whose names are invalid c# identifiers.
Visual Studio 2012 (with ASP.NET and Web Tools 2012.2 RC installed) supports this natively.
Visual Studio 2013 onwards have this built-in.
(Image courtesy: robert.muehsig)
If you install Web Essentials into Visual studio you can go to Edit => Past special => paste JSON as class.
That is probably the easiest there is.
Web Essentials: http://vswebessentials.com/