VS 2010 JSON deserialisation / Conversion to individual String

Currently I have a string that contains data in JSON format. What i Want to do is split these up into their individual components. The messgae string can contain multiple record instances with the record type being defined at the begining.

I assume that I have to set up some sort of class (s)

I have managed to convert a string to JSON, but despite all the info around, I am struggling a little.

Any assistance would be appreciated