toJSON

        public static string ToJSON(IEnumerable array, params string[] propertyNames)
        {
            Guard<ArgumentNullException>(array == null || propertyNames == null);
            if (propertyNames.Length > 0)
            {
                IEnumerator tor = array.GetEnumerator();
                if (tor.MoveNext())
                {
                    StringBuilder json = new StringBuilder("[{");
                    object entity = tor.Current;
                    Type type = entity.GetType();
                    PropertyInfo property;
                    foreach (string name in propertyNames)
                    {
                        property = type.GetProperty(name, BindingFlags.Public | BindingFlags.Instance | BindingFlags.GetProperty);
                        if (property != null)
                        {
                            json.Append(property.Name).Append(':');
                            AppendJSONValue(json, property, GetPropertyAccess(property).GetValue(entity));
                            json.Append(',');
                        }
                    }
                    json.Length--;
                    json.Append('}');
                    while (tor.MoveNext())
                    {
                        entity = tor.Current;
                        type = entity.GetType();
                        json.Append(",{");
                        foreach (string name in propertyNames)
                        {
                            property = type.GetProperty(name, BindingFlags.Public | BindingFlags.Instance | BindingFlags.GetProperty);
                            if (property != null)
                            {
                                json.Append(property.Name).Append(':');
                                AppendJSONValue(json, property, GetPropertyAccess(property).GetValue(entity));
                                json.Append(',');
                            }
                        }
                        json.Length--;
                        json.Append('}');
                    }
                    return json.Append("]").ToString();
                }
            }
            return "[]";
        }

        private static void AppendJSONValue(StringBuilder buffer, PropertyInfo property, object value)
        {
            switch (Type.GetTypeCode(property.PropertyType))
            {
                case TypeCode.Boolean:
                    buffer.Append(value.ToString().ToLower());
                    break;
                case TypeCode.DateTime:
                    DateTime time = Convert.ToDateTime(value);
                    buffer.Append("new Date(")
                        .Append(time.Year).Append(',')
                        .Append(time.Month - 1).Append(',')
                        .Append(time.Day).Append(',')
                        .Append(time.Hour).Append(',')
                        .Append(time.Minute).Append(',')
                        .Append(time.Second).Append(')');
                    break;
                case TypeCode.String:
                    buffer.Append('"').Append(value).Append('"');
                    break;
                default:
                    buffer.Append(value);
                    break;
            }
        }