public override string ToString()
        {
            StringBuilder sb = new StringBuilder("{ ");
            ToString(sb);
            sb.Append("}");
            return sb.ToString();
        }

        private void ToString(StringBuilder sb)
        {
            bool firstDict = true;
            foreach (var pair in _dictionary)
            {
                if (!firstDict)
                    sb.Append(",");
                firstDict = false;
                sb.Append("\"" + pair.Key + "\": ");

                if (pair.Value is string)
                {
                    sb.Append("\"" + pair.Value.ToString() + "\"");
                }
                else if (pair.Value is Dictionary<string, object>)
                {
                    sb.Append((new DynamicJsonObject(pair.Value as Dictionary<string, object>).ToString()));
                }
                else if (pair.Value is ArrayList)
                {
                    if((pair.Value as ArrayList).Count > 1)
                        sb.Append("[");
                    bool firstAL = true;
                    foreach (var item in pair.Value as ArrayList)
                    {
                        if (!firstAL)
                            sb.Append(",");
                        firstAL = false;
                        if (item is string)
                            sb.Append("\"" + item + "\"");
                        else if (item is IDictionary<string, object>)
                            sb.Append((new DynamicJsonObject(item as Dictionary<string, object>).ToString()));
                        else
                        {
                            sb.Append("ERROR");
                        }
                    }
                    if ((pair.Value as ArrayList).Count > 1)
                        sb.Append("]");
                }
                else
                {
                    sb.Append("ERROR");
                }
            }
        }