C#JSONデータ生成

        protected void Page_Load(object sender, EventArgs e)

        {

            Response.Clear();

            Response.ContentType = "application/json;charset=utf-8";



            string str = "";

            DataSet ds = SqlHelper.GetSqlDataSet("select top 3 Staff_id,name_sc as Staff_name from [tbl_ac_info] where status='A'");

            

            List<tbl_ac_info> list = new List<tbl_ac_info>();

            foreach (DataRow item in ds.Tables[0].Rows)

            {

                list.Add(new tbl_ac_info() { Staff_id = item[0].ToString(), Staff_name = item[1].ToString() });

            }

            str = ObjToJSON(list);

            Response.Write(str);

            Response.End();

        }

    [DataContract]

    [Serializable]

    public class tbl_ac_info

    {

        [DataMember]

        public string Staff_id { set; get; }

        [DataMember]

        public string Staff_name { set; get; }



    }

        /// <summary>

        ///   JSON  

        /// </summary>

        /// <param name="obj">      ,     </param>

        /// <returns></returns>

        protected string ObjToJSON(object obj)

        {

            DataContractJsonSerializer serializer = new DataContractJsonSerializer(obj.GetType());

            Stream stream = new MemoryStream();

            serializer.WriteObject(stream, obj);

            stream.Position = 0;

            StreamReader streamReader = new StreamReader(stream);

            return streamReader.ReadToEnd();

        }

<script type="text/javascript">

    $(function () {

        GetJSON();

    });

    function GetJSON() {

        $.getJSON("Ajax.aspx?action=export_app&n=" + Math.random(), { "div": "", "app_type": "formula" }, function (data) {

            $("#listStaff_id").html("<font color=green>     ...</font>"); 

            if (data.length > 0) {

                var list = "";

                $.each(eval(data), function (index, json) {

                    list += json.Staff_id + " / " + json.Staff_name + "<br>";

                });

                $("#listStaff_id").html(list);

            }

            else {

                $("#listStaff_id").html("    ");

            }

        });

    }

</script>

ネーミングスペースを導入する必要があります:using System.Runtime.Serialization.Json;using System.ServiceModel.Web;