Check out example codes for "Newtonsoft.Json.JsonSerializationException: 'Self referencing loop detected for property". It will help you in understanding the concepts better.

Code Example 1

// It seems that you have a reacurring properties in your object.
// You can either clean up your object and make sure you are not getting
// The properties multiple times OR you can tell your serializer 
// That this is acceptable behavior like this:

var settings = new Newtonsoft.Json.JsonSerializerSettings();
// This tells your serializer that multiple references are okay.
settings.ReferenceLoopHandling = ReferenceLoopHandling.Ignore;

return JsonConvert.SerializeObject(<Your Object>, settings);

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