I have spent a lot of time to find a solution for my problem.
In this example, I have 2 records in SetNavRecords array. The first one is \"Artikelnummer\" :
I would have created classes by the name SetNavRecords and OfflineVerkaufspreis. Then I would have used JavaScriptSerializer from namespace System.Web.Script.Serialization.JavaScriptSerializer to deserialize it.
Code goes like this-
JavaScriptSerializer.Deserialize(String, Type);
Then I can operate it like simple generic collection eg. list.
Hope this will help you little bit.