how to deserialize Json data in windows form application?

hi,

you can deserialize Json data using JavaScriptSerializer.Deserialize method.

Please refer
http://msdn.microsoft.com/en-us/library/bb355316.aspx

and yes, you can use DataContractJsonSerializer if you data class are marked as DataContract and properties are marked as Datamember.
http://msdn.microsoft.com/en-us/library/bb412179.aspx

for do this you have to take refer of system.web in your application.

hope this will help you.