How to create GridTemplateColumn in code-behind?

public partial class MainPage : ContentPage
{
       private SfDataGrid sfDataGrid;
       private OrderInfoRepository gridData;
 
       public MainPage()
       {
          sfDataGrid = new SfDataGrid();
          gridData = new OrderInfoRepository();
          sfDataGrid.AutoGenerateColumns = false;
          var templateColumn=new GridTemplateColumn()
           { 
              MappingName = "OrderID", 
              HeaderText = "OrderID", 
              Width=100
            };
            var dataTemplate = new DataTemplate(()=>
            {
                var label = new SfLabel()
                {
                    TextColor = Color.Blue,
                    VerticalOptions = LayoutOptions.Center,
                    HorizontalOptions=LayoutOptions.Center
                };
                label.SetBinding(SfLabel.TextProperty, "OrderID");
                return label;
             });
            templateColumn.CellTemplate = dataTemplate;
            sfDataGrid.Columns.Add(templateColumn);
            sfDataGrid.Columns.Add(new GridTextColumn() { MappingName = "CustomerID", Width = 100 });
            sfDataGrid.Columns.Add(new GridTextColumn() { MappingName = "ShipCountry", Width = 100 });
            sfDataGrid.ItemsSource = gridData.OrderInfoCollection;
            this.Content = sfDataGrid;
      }
 }