JQGrid中未显示JSON数据

我看过所有相关答案中的建议，但都无济于事。我尝试了各种选择，但又一次都无济于事。我使用ASP.NET，C#作为处理语言，Oracle 10g用作数据库引擎。

这是我的.aspx文件：

<form id="LocalizationSearch" name="locSearch" defaultbutton="updateButton" runat="server">
   <script language="javascript" type="text/javascript">
    jQuery(document).ready(function () {
        var createLanguageList = function () {
            $("#list").jqGrid({
                url: "KPHandler.ashx?langname=English",
                datatype: "json",
                contentType: "application/json; charset=utf-8", 
                mtype: 'POST',
                //datatype: "local",
                //data: mydata,
                autowidth: true,
                height: 150,
                colNames: ['DelLanguageID', 'DocRecID', 'LanguageID', 'DocPartNumber,', 'NewLanguage', 'ConcentraIDLang', 'ActFromTranslation'],
                colModel: [
                    { name: 'DelLanguageID', index: 'DelLanguageID', width: 65, editable: false },
                    { name: 'DocRecID', index: 'DocRecID', width: 65, editable: false },
                    { name: 'LanguageID', index: 'LanguageID', width: 65, editable: false },
                    { name: 'DocPartNmbr', index: 'DocPartNmbr', width: 65, editable: true },
                    { name: 'NewLanguage', index: 'NewLanguage', editable: true, edittype: 'checkbox', editoptions: { value: "1:0"} },
                    { name: 'ConcentraIDLang', index: 'ConcentraIDLang', width: 65, editable: true },
                    { name: 'ActFromTranslation', index: 'ActFromTranslation', width: 120, editable: true }
                ],
                rowNum: 5,
                rowList: [10, 20, 30],
                pager: '#pager',
                sortname: 'DelLanguageID',
                viewrecords: true,
                //altRows: true,
                //sortorder: "desc",
                caption: "Deliverable Languages",
                //height: "100%",
                loadonce: true, 
                gridview: true, 
                autoencode: true,
                loadError: function (jqXHR, textStatus, errorThrown) {
                    alert('Error: ' + textStatus + errorThrown + jqXHR.responseText);
                }
            });  // JQGrid
        };  // Create function
        $("#btnLanguages").click(function () {
            createLanguageList();
        });
    });   // document ready 
</script>
    <table cellspacing="1" cellpadding="0" width="100%">
        <tr>
            <td valign="top">
                <table id="list"></table>
                <div id="pager"></div>
        </td>
        </tr>
    </table>
    <input type="button" id="btnLanguages" value="Work With Languages"  />
</form>

这是我构建JSON对象的C#代码：

<%@ WebHandler Language="C#" Class="KPHandler" %>
using System;
using System.Web;
using System.Web.Script.Serialization;
using System.Web.Configuration; 
using System.Text;
using System.Data;
using System.Collections.Generic;
using System.Configuration;
using System.Data.OracleClient;
public class KPHandler : IHttpHandler
{
    private DKCL.ReportDK Rpt = new DKCL.ReportDK();
    public void ProcessRequest(HttpContext context)
    {
        context.Response.ContentType = "application/json";
        System.Collections.Specialized.NameValueCollection forms = context.Request.Form;
        string strOperation = forms.Get("oper");
        switch (strOperation)
        {
            case null:  // means this is the first time load
                string strSQL = "SELECT DelLanguageID, DocRecID, LanguageID, DocPartNmbr, NewLanguage, " +
                                "ConcentraIDLang, ActFromTranslation FROM DELLANGUAGES WHERE DOCRECID = 18787";
                DataTable dlLanguages = Rpt.GetDataTable(strSQL);
                context.Response.Write(GetJson(dlLanguages));
                break;
            default:
                break;
        }  // End Switch
    }
    // This is generic function that converts DataTable into JSON object.
    public string GetJson(DataTable dt)
    {
        System.Web.Script.Serialization.JavaScriptSerializer serializer = new
        System.Web.Script.Serialization.JavaScriptSerializer();
        List<Dictionary<string, object>> rows =
          new List<Dictionary<string, object>>();
        Dictionary<string, object> row = null;
        foreach (DataRow dr in dt.Rows)
        {
            row = new Dictionary<string, object>();
            foreach (DataColumn col in dt.Columns)
            {
                row.Add(col.ColumnName.Trim(), dr[col]);
            }
            rows.Add(row);
        }
        return serializer.Serialize(rows);
    }
    public bool IsReusable
    {
        get
        {
            return false;
        }
    }
}

这是上面代码返回的JSON数据（我实际上得到了Fiddler2所示的数据），以及我自己对代码的调试

            [{"DELLANGUAGEID":"4613","DOCRECID":"18787","LANGUAGEID":"12","DOCPARTNMBR":null,"NEWLANGUAGE":0,"CONCENTRAIDLANG":"c02609839","ACTFROMTRANSLATION":null},{"DELLANGUAGEID":"4614","DOCRECID":"18787","LANGUAGEID":"34","DOCPARTNMBR":null,"NEWLANGUAGE":0,"CONCENTRAIDLANG":null,"ACTFROMTRANSLATION":null},{"DELLANGUAGEID":"4615","DOCRECID":"18787","LANGUAGEID":"1","DOCPARTNMBR":null,"NEWLANGUAGE":0,"CONCENTRAIDLANG":"c02606925","ACTFROMTRANSLATION":null},{"DELLANGUAGEID":"4616","DOCRECID":"18787","LANGUAGEID":"13","DOCPARTNMBR":null,"NEWLANGUAGE":0,"CONCENTRAIDLANG":"c02609850","ACTFROMTRANSLATION":null},{"DELLANGUAGEID":"4617","DOCRECID":"18787","LANGUAGEID":"11","DOCPARTNMBR":null,"NEWLANGUAGE":0,"CONCENTRAIDLANG":"c02606924","ACTFROMTRANSLATION":null},{"DELLANGUAGEID":"4618","DOCRECID":"18787","LANGUAGEID":"3","DOCPARTNMBR":null,"NEWLANGUAGE":0,"CONCENTRAIDLANG":"c02606920","ACTFROMTRANSLATION":null},{"DELLANGUAGEID":"4619","DOCRECID":"18787","LANGUAGEID":"21","DOCPARTNMBR":null,"NEWLANGUAGE":0,"CONCENTRAIDLANG":null,"ACTFROMTRANSLATION":null},{"DELLANGUAGEID":"39703","DOCRECID":"18787","LANGUAGEID":"142","DOCPARTNMBR":"593957-001","NEWLANGUAGE":0,"CONCENTRAIDLANG":null,"ACTFROMTRANSLATION":null},{"DELLANGUAGEID":"89446","DOCRECID":"18787","LANGUAGEID":"161","DOCPARTNMBR":null,"NEWLANGUAGE":0,"CONCENTRAIDLANG":null,"ACTFROMTRANSLATION":null},{"DELLANGUAGEID":"97174","DOCRECID":"18787","LANGUAGEID":"162","DOCPARTNMBR":null,"NEWLANGUAGE":0,"CONCENTRAIDLANG":null,"ACTFROMTRANSLATION":null},{"DELLANGUAGEID":"112630","DOCRECID":"18787","LANGUAGEID":"164","DOCPARTNMBR":null,"NEWLANGUAGE":0,"CONCENTRAIDLANG":null,"ACTFROMTRANSLATION":null},{"DELLANGUAGEID":"104902","DOCRECID":"18787","LANGUAGEID":"163","DOCPARTNMBR":null,"NEWLANGUAGE":0,"CONCENTRAIDLANG":null,"ACTFROMTRANSLATION":null}]

知道可能出了什么问题吗网格显示正确数量的记录以及寻呼机中的页面任何帮助都将不胜感激
顺便说一句，我尝试了GET与POST、json与jsonstring等以及许多其他选项，包括json阅读器，但没有成功。