GanttChartDataGrid CRUD errors

See more:

C#

Silverlight5

Hi there.

I am trying to get the selected data from the database through a webservice to a silverlight gantt control. Data items show on the grid but the data is not visible in those items. I don't know what the problem is. Here is a sample:

* Select Statement:

[OperationContract]
        public List<projectgantt> Select(int reference)
        {
            List<projectgantt> list = new List<projectgantt>();
            using (SqlConnection con = new SqlConnection(conn))
            {
                string query = "SELECT ganttDescription, ganttStartDate, ganttEndDate, ganttDuration, ganttPredecessor, ganttProgress, ganttResources FROM dbo.ProjectGantt";
                using (SqlCommand cmd = new SqlCommand(query, con))
                {
                    con.Open();                  
                    using (SqlDataReader reader = cmd.ExecuteReader())
                    {
                        while (reader.Read())
                        {
                            ProjectGantt t = new ProjectGantt();
                            t.ganttDescription = reader.GetValue(0).ToString();
                            t.ganttStartDate = reader.GetValue(1).ToString();
                            t.ganttEndDate = reader.GetValue(2).ToString();
                            t.ganttDuration = reader.GetValue(3).ToString();
                            t.ganttPredecessor = reader.GetValue(4).ToString();
                            t.ganttProgress = reader.GetValue(5).ToString();
                            t.ganttResources = reader.GetValue(6).ToString();
                            list.Add(t);
                        }
                    }
                }
            }
            return list;
        }

* Webservice call method

void Proxy_SelectCompleted(object sender, SelectCompletedEventArgs e)
        {
            GanttChartDataGrid.ItemsSource = e.Result;
        }

Could please you help me resolve this problem. Immediate response would be very much appreciated.

Thank you
Kholisa.