Copy the property values to another object with C# [duplicate]

Answer 1

   public static TTarget Convert(TSource sourceItem)
        {
            if (null == sourceItem)
            {
                return default(TTarget);
            }

            var deserializeSettings = new JsonSerializerSettings { ObjectCreationHandling = ObjectCreationHandling.Replace,  };

            var serializedObject = JsonConvert.SerializeObject(sourceItem, deserializeSettings);

            return JsonConvert.DeserializeObject(serializedObject);
        }

usage:

  promosion = YourClass.Convert(existsPromosion);