private void BtnThread_Click(object sender, RoutedEventArgs e)
        {
            thread = new Thread(new ThreadStart(ThreadLoop));
            thread.SetApartmentState(ApartmentState.STA);
            thread.Start();
        }
        public void ThreadLoop()
        {
            DateTime? dtdebTemp = new DateTime();
            DateTime? dtfinTemp = new DateTime();
            DataGrid dg = new DataGrid();
            DataGridTextColumn col = new DataGridTextColumn();
            col.Header = "test";
            Application.Current.Dispatcher.Invoke(new Action(() =>
            {
                dtdebTemp = dtDeb.Value;
                dtfinTemp = dtFin.Value;
                dg = MyDataGridOfMainThread;
            }));
            dg.Columns.Add(col);
        }