I’ve added the reference to System.Runtime.Serialization dll to my project but still can’t find the System.Runtime.Serialization.Json namespace and hence can’t find the DataContractJsonSerializer class. What am I missing here?
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Try in System.ServiceModel.Web.dll
Are you running .NET 2.0 ? Its first supported in 3.5 and 4.0 check here.
I think this library is now deprecated in favour of Json.NET. JsonObject is a JObject and uses Json.NET library.
You might just need to update it in your VS, it can be added in the project but not updated