/// <summary>
    /// Reads the JSON representation of the object.
    /// </summary>
    /// <param name="reader">The <see cref="JsonReader"/> to read from.</param>
    /// <param name="objectType">Type of the object.</param>
    /// <param name="existingValue">The existing value of object being read.</param>
    /// <param name="serializer">The calling serializer.</param>
    /// <returns>The object value.</returns>
    public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
    {
      DataSet ds = new DataSet();

      DataTableConverter converter = new DataTableConverter();

      reader.Read();

      while (reader.TokenType == JsonToken.PropertyName)
      {
        DataTable dt = (DataTable)converter.ReadJson(reader, typeof (DataTable), null, serializer);
        ds.Tables.Add(dt);

        reader.Read();
      }

      return ds;
    }
    /// <summary>
    /// Writes the JSON representation of the object.
    /// </summary>
    /// <param name="writer">The <see cref="JsonWriter"/> to write to.</param>
    /// <param name="value">The value.</param>
    /// <param name="serializer">The calling serializer.</param>
    public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
    {
      DataSet dataSet = (DataSet)value;
      DefaultContractResolver resolver = serializer.ContractResolver as DefaultContractResolver;

      DataTableConverter converter = new DataTableConverter();

      writer.WriteStartObject();

      foreach (DataTable table in dataSet.Tables)
      {
        writer.WritePropertyName((resolver != null) ? resolver.ResolvePropertyName(table.TableName) : table.TableName);
        
        converter.WriteJson(writer, table, serializer);
      }

      writer.WriteEndObject();
    }