ASP.NET中如何動態產生模板列

/// <summary>
 /// 實現ITemplate介面，用來列印
 /// </summary>
 public class ColumnTemplate : ITemplate
 {   
  public void InstantiateIn(Control container)
  {
   LinkButton lb = new LinkButton();
   lb.Text = "列印";  
   lb.CommandName = "Print";
   container.Controls.Add(lb);
  }
 }
 /// <summary>
 /// 實現ITemplate介面，用來匯出
 /// </summary>
 public class ColumnTemplateExport : ITemplate
 {   
  public void InstantiateIn(Control container)
  {
   LinkButton lb = new LinkButton();
   lb.Text = "匯出";  
   lb.CommandName = "Export";
   container.Controls.Add(lb);
  }
 }

 /// <summary>
  /// 清空GRID的COLUMN
  /// </summary>
  /// <param name="vardg"></param>
  private static void RefreshGrid(DataGrid vardg)
  {
   vardg.Columns.Clear();
  
   BoundColumn dc = new BoundColumn();  
   dc.HeaderText = "ID";
   dc.HeaderStyle.HorizontalAlign = HorizontalAlign.Center;
   dc.DataField = "ID";
   dc.Visible = false;
   dc.ItemStyle.HorizontalAlign = HorizontalAlign.Center;  
   vardg.Columns.AddAt(0,dc);

   dc = new BoundColumn();  
   dc.HeaderText = "序號";
   dc.HeaderStyle.Wrap = false;
   dc.HeaderStyle.Width = 30;
   dc.HeaderStyle.HorizontalAlign = HorizontalAlign.Center; 
   dc.ItemStyle.HorizontalAlign = HorizontalAlign.Center;  
   vardg.Columns.AddAt(1,dc);
  }

  /// <summary>
  /// 建立按專家列印的GRID
  /// </summary>
  /// <param name="vardg"></param>
  private static void CreateExpertDataGrid(DataGrid vardg)
  { 
   RefreshGrid(vardg);

   BoundColumn dc = new BoundColumn();  
   dc.HeaderText = "專家姓名";
   dc.HeaderStyle.Wrap = false;
   dc.HeaderStyle.HorizontalAlign = HorizontalAlign.Center;
   dc.DataField = "EXPERT_NAME";
   dc.SortExpression = "EXPERT_NAME";
   dc.ItemStyle.HorizontalAlign = HorizontalAlign.Center;  
   vardg.Columns.AddAt(2,dc);
  
   dc = new BoundColumn();
   dc.HeaderText = "所屬醫院";
   dc.HeaderStyle.Wrap = false;
   dc.HeaderStyle.HorizontalAlign = HorizontalAlign.Center;
   dc.DataField = "HOSPITAL";
   dc.SortExpression = "HOSPITAL";  
   vardg.Columns.AddAt(3,dc);  
    
   TemplateColumn  tc = new TemplateColumn();
   tc.ItemTemplate = new ColumnTemplate();
   tc.HeaderText = "列印";
   dc.HeaderStyle.Wrap = false;
   tc.HeaderStyle.HorizontalAlign = HorizontalAlign.Center;
   tc.ItemStyle.HorizontalAlign = HorizontalAlign.Center;
   tc.HeaderStyle.Width = 30;
   vardg.Columns.AddAt(4,tc); 
     
   tc = new TemplateColumn();
   tc.ItemTemplate = new ColumnTemplateExport();
   tc.HeaderText = "匯出";
   dc.HeaderStyle.Wrap = false;
   tc.HeaderStyle.HorizontalAlign = HorizontalAlign.Center;
   tc.ItemStyle.HorizontalAlign = HorizontalAlign.Center;
   tc.HeaderStyle.Width = 30;
   vardg.Columns.AddAt(5,tc); 
  }