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JsonHelper.cs

public static class JsonHelper
{
    public static string ToJson(this object obj)
    {
        var serializer = new JavaScriptSerializer();
        return serializer.Serialize(obj);
    }

    public static string ToJson(this object obj, int recursionDepth)
    {
        var serializer = new JavaScriptSerializer();
        serializer.RecursionLimit = recursionDepth;
        return serializer.Serialize(obj);
    }
}