Converting a custom class from JSON to .NET

Hi all!
I'm trying to send a custom object from the client to a webservice but keep getting exceptions.
 This is my JSON data:
  
{"__type":"MontDor.Wizard","From":"\/Date(1178920800000)\/","To":"\/Date(1178920800000)\/","MultibleDays"

:false,"LocationName":null,"LocationAddress":null,"LocationZipCode":null,"ContactName":null,"ContactPhone"

:null,"ContactEmail":null,"ContactAtEventName":null ...