DataTable 轉換JSON

private string DataTableToJson(DataTable dt)        {            StringBuilder jsonBuilder = new StringBuilder();            jsonBuilder.Append("{\"");            jsonBuilder.Append(dt.TableName);            jsonBuilder.Append("\":[");            for (int i = 0; i < dt.Rows.Count; i++)            {                jsonBuilder.Append("{");                for (int j = 0; j < dt.Columns.Count; j++)                {                    jsonBuilder.Append("\"");                    jsonBuilder.Append(dt.Columns[j].ColumnName);                    jsonBuilder.Append("\":\"");                    jsonBuilder.Append(dt.Rows[i][j].ToString());                    jsonBuilder.Append("\",");                }                jsonBuilder.Remove(jsonBuilder.Length - 1, 1);                jsonBuilder.Append("},");            }            jsonBuilder.Remove(jsonBuilder.Length - 1, 1);            jsonBuilder.Append("]");            jsonBuilder.Append("}");            return jsonBuilder.ToString();        }