Defining grid columns.

GridColumns.cs

protected void Page_Load(object sender, EventArgs e)
{
  GetGridColumns().ForEach(f => _grid.Columns.Add(f));
  _grid.DataSource = new BoxEnumerable<ICanine>(GetCanines());
  _grid.DataBind();
}

private static List<DataGridColumn> GetGridColumns()
{
  return new List<DataGridColumn>
  {
    new TemplateColumn 
    {
      HeaderText = "Biscuits?", 
      ItemTemplate = new FoodColumnTemplate(Food.Biscuit)
    },
    new TemplateColumn 
    {
      HeaderText = "Meatballs?", 
      ItemTemplate = new FoodColumnTemplate(Food.Meatballs)
    },
    new TemplateColumn 
    {
      HeaderText = "You?", 
      ItemTemplate = new FoodColumnTemplate(Food.You)
    }
  };
}

private static IEnumerable<ICanine> GetCanines()
{
  return new List<ICanine> {new Dog(), new Wolf(), new Chihuahua() };
}