DataTable轉換成JSON（實驗區APP版本）

/// <summary>
        /// dataTable轉換成Json格式
        /// </summary>
        /// <param name="dt"></param>
        /// <param name="success"></param>
        /// <param name="errMsg"></param>
        /// <param name="totalPageNo">總頁數</param>
        /// <returns></returns>
        public static string ToJson(DataTable dt, int success, string errMsg, int totalPageNo)
        {
            StringBuilder jsonBuilder = new StringBuilder();
            jsonBuilder.Append("{");
            jsonBuilder.Append("\"success\":\"" + success + "\",");
            //jsonBuilder.Append("\"" + dt.TableName.ToString() + "\"");
            jsonBuilder.Append("\"ds\"");
            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(System.Web.HttpUtility.HtmlEncode(ChangeString(dt.Rows[i][j].ToString())));                    

                    jsonBuilder.Append("\",");
                }
                jsonBuilder.Remove(jsonBuilder.Length - 1, 1);
                jsonBuilder.Append("},");
            }
            if (dt.Rows.Count > 0)
                jsonBuilder.Remove(jsonBuilder.Length - 1, 1);
            jsonBuilder.Append("]");
            jsonBuilder.Append(",\"totalPageNo\":\"" + totalPageNo + "\"");
            jsonBuilder.Append(",\"errMsg\":\"" + errMsg + "\"");
            jsonBuilder.Append("}");

            string json = jsonBuilder.ToString();
            return json;
        }