GetJsonByDataTable

        public string getJsonByModel(DataTable dt)

        {

            StringBuilder nsb = new StringBuilder();

            for (int i = 0; i < dt.Rows.Count; i++)

            {

                StringBuilder sb = new StringBuilder();

                sb.Append("{");

                foreach (DataColumn mDc in dt.Columns)

                {

                    if (dt.Rows[i][mDc] != null)

                    {

                        var cname = mDc.ColumnName;

                        var cvalue = "";

                        cvalue = dt.Rows[i][mDc].ToString();

                        sb.Append("\"" + cname + "\":").Append("\"" + Microsoft.JScript.GlobalObject.escape(cvalue) + "\",");

                    }

                    else

                    {

                        sb.Append("\"" + mDc.ColumnName + "\":").Append("\"\",");

                    }

                }

                var ss = sb.ToString();

                ss = ss.Remove(ss.LastIndexOf(","), 1);

                ss += "}";

                nsb.Append(ss);

                if (i < dt.Rows.Count - 1)

                {

                    nsb.Append(",");

                }

            }

            return nsb.ToString();

        }