Attempting to use JSON serialization assembly reference for C#.Net project.
Apparently this has to be separately downloaded and installed through the management of NuGet packages. This is detailed in other answers is StackOverflow. However, much to my surprise, this does not seem to have resolved the problem.

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The System.Runtime.Serialization.Json reference also does not appear in the Framework Assemblies. There does not seem to be any mention of JSON in the extensions either.

using Newtonsoft.Json;, they're different assemblies and you should just use json.net cause as I was just saying it's a lot better (newtonsoft.json is json.net in case you're not aware).Newtonsoft.Jsonis one of the assemblies/namespaces within json.NET. I put that comment in parens because I was interchanging the names and wanted to make it clear that I was referring to the same thing throughout my comments. Also, as I said in the first comment that[CollectionDataContractAttribute]annotation nonsense is required forSerialization.Json, it's not used by other libraries and will cause compilation errors if you don't use that library. In my first comment I have the line of code you should use.