สอบถามเรื่องการ get object ออกมาจาก web service(json) มาใช้ใน javascript

public class getGantt : System.Web.Services.WebService
    {

        [WebMethod]
        public string resultProject(string strProject)
        {
            using (SqlConnection connection = new SqlConnection
        (ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString))
            {
                string Query = "SELECT Line_number FROM [Project_Config] ORDER BY [Project_id] DESC";
                SqlCommand command = new SqlCommand(Query, connection);
                command.CommandType = CommandType.Text;
                connection.Open();
                SqlDataReader reader = command.ExecuteReader();

                DataTable myTable = new DataTable("myTable");
                myTable.Columns.Add("Line_number", typeof(string));


                while (reader.Read())
                {
                    myTable.Rows.Add(new object[]
                 {
                      reader["Line_number"].ToString() });
                }
                //myTable.Load(reader);
                myTable.AcceptChanges();
                DataSet ds = new DataSet();
                ds.Tables.Add(myTable);
                ds.AcceptChanges();
                

                string json = JsonConvert.SerializeObject(ds, Newtonsoft.Json.Formatting.Indented);
                return json;

            }
        }
    }

<script type="text/javascript">

        var g = new JSGantt.GanttChart('g', document.getElementById('GanttChartDIV'), 'week');
        g.setShowRes(1); // Show/Hide Responsible (0/1)
        g.setShowDur(1); // Show/Hide Duration (0/1)
        g.setShowComp(1); // Show/Hide % Complete(0/1)

       
        if (g) {

            // Method 1: Using AddTaskItem
            g.AddTaskItem(new JSGantt.TaskItem(1, $result["Line_number"], 'ff0000', 'http://help.com', 0, 'Brian', 0, 1, 0, 1));

            g.Draw();
            g.DrawDependencies();

        }
        else {
            alert("not defined");
        }   
    
    </script>