public static string ToJson(DataNode node)
        {
            StringBuilder stringBuilder = new StringBuilder();

            stringBuilder.Append('{');
            DataNodeJson.ToJson(node, stringBuilder, false);
            stringBuilder.Append('}');
            return(stringBuilder.ToString());
        }
        public static void ToJsonFile(DataNode node, string fileName)
        {
            string value = DataNodeJson.ToJson(node);

            using (StreamWriter streamWriter = new StreamWriter(fileName))
            {
                streamWriter.Write(value);
                streamWriter.Close();
            }
        }
        public static void ToJson(DataNode node, StringBuilder sb, bool listItem = false)
        {
            string arg = "nullName";

            if (!string.IsNullOrEmpty(node.Name))
            {
                arg = node.Name;
            }
            if (string.IsNullOrEmpty(node.Content))
            {
                if (node.Nodes == null || node.Nodes.Count == 0)
                {
                    if (listItem)
                    {
                        if (node.IsList)
                        {
                            sb.Append("[]");
                        }
                        else
                        {
                            sb.Append("\"\"");
                        }
                    }
                    else if (node.IsList)
                    {
                        sb.AppendFormat("\"{0}\":[]", arg);
                    }
                    else
                    {
                        sb.AppendFormat("\"{0}\":\"\"", arg);
                    }
                }
                else
                {
                    if (!listItem)
                    {
                        sb.AppendFormat("\"{0}\":", arg);
                    }
                    if (node.IsList)
                    {
                        sb.Append('[');
                    }
                    else
                    {
                        sb.Append('{');
                    }
                    for (int i = 0; i < node.Nodes.Count; i++)
                    {
                        DataNode node2 = node.Nodes[i];
                        DataNodeJson.ToJson(node2, sb, node.IsList);
                        if (i != node.Nodes.Count - 1)
                        {
                            sb.Append(',');
                        }
                    }
                    if (node.IsList)
                    {
                        sb.Append("]");
                    }
                    else
                    {
                        sb.Append('}');
                    }
                }
            }
            else
            {
                if (node.Nodes != null && node.Nodes.Count > 0)
                {
                    throw new Exception("Node can't contain content and subnodes");
                }
                if (listItem)
                {
                    sb.AppendFormat("\"{0}\"", node.Content.Replace("\"", "\\\""));
                }
                else
                {
                    sb.AppendFormat("\"{0}\":\"{1}\"", arg, node.Content.Replace("\"", "\\\""));
                }
            }
        }