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using Newtonsoft.Json;

public static class ObjectCopier
    {
        /// <summary>
        /// Perform a deep Copy of the object, using Json as a serialisation method. NOTE: Private members are not cloned using this method.
        /// </summary>
        /// <typeparam name="T">The type of object being copied.</typeparam>
        /// <param name="source">The object instance to copy.</param>
        /// <returns>The copied object.</returns>
        public static T Clone<T>(this T source)
        {
            // Don't serialize a null object, simply return the default for that object
            if (ReferenceEquals(source, null))
            {
                return default(T);
            }

            // initialize inner objects individually
            // for example in default constructor some list property initialized with some values,
            // but in 'source' these items are cleaned -
            // without ObjectCreationHandling.Replace default constructor values will be added to result
            var deserializeSettings = new JsonSerializerSettings { ObjectCreationHandling = ObjectCreationHandling.Replace };

            return JsonConvert.DeserializeObject<T>(JsonConvert.SerializeObject(source), deserializeSettings);
        }
    }

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var newObj = oldObj.Clone();