WPF Code Behind TempleteColumn

DataGridTemplateColumn col1 = new DataGridTemplateColumn();
col1.Header = "MyHeader";
FrameworkElementFactory factory1 = new FrameworkElementFactory(typeof(CheckBox));
Binding b1 = new Binding("IsSelected");
b1.Mode = BindingMode.TwoWay;
factory1.SetValue(CheckBox.IsCheckedProperty, b1);
factory1.AddHandler(CheckBox.CheckedEvent, new RoutedEventHandler(chkSelect_Checked));
DataTemplate cellTemplate1 = new DataTemplate();
cellTemplate1.VisualTree = factory1;
col1.CellTemplate = cellTemplate1;
dgTransportReqsts.DataGrid.Columns.Add(col1);