分页：AllowPaging= TRUE!!!!
 private void dgCategory_PageIndexChanged(object source, System.Web.UI.WebControls.DataGridPageChangedEventArgs e)
  {
   dgCategory.CurrentPageIndex=e.NewPageIndex;
   dgCategory.DataBind();
  }
排序：默认按“PKId”排序
private void dgCategory_SortCommand(object source, System.Web.UI.WebControls.DataGridSortCommandEventArgs e)
  {
   string SortOrder=e.SortExpression.ToString();
   BindData(SortOrder);
  }

private void BindData(string SortOrder)
  {
   ProductSystem productSys=new ProductSystem();
   CategoryData  categorySet=productSys.GetCategories(1);
   DataView      categoryView=categorySet.Tables[CategoryData.CATEGORIES_TABLE].DefaultView;
            categoryView.Sort=SortOrder;
   
   lblTitle.Text="按"+SortOrder+"排序";
   dgCategory.DataSource=categoryView;
   dgCategory.DataBind();
  }
private void Page_Load(object sender, System.EventArgs e)
  {
   BindData("PKId");
  }
编辑，更新，取消：
private void dgCategory_EditCommand(object source, System.Web.UI.WebControls.DataGridCommandEventArgs e)
  {
   dgCategory.EditItemIndex=e.Item.ItemIndex;
   BindData("PKId");
  }
  private void dgCategory_CancelCommand(object source, System.Web.UI.WebControls.DataGridCommandEventArgs e)
  {
   dgCategory.EditItemIndex=-1;
   BindData("PKId");
  }
private void dgCategory_UpdateCommand(object source, System.Web.UI.WebControls.DataGridCommandEventArgs e)
  {
   string strUpdate="";
   strUpdate+="PKId='"+((TextBox)e.Item.Cells[1].Controls[0]).Text+"'";
   strUpdate+="ParentId='"+((TextBox)e.Item.Cells[2].Controls[0]).Text+"'";
   strUpdate+="Description='"+((TextBox)e.Item.Cells[3].Controls[0]).Text+"'";
   strUpdate+="IsLeaf='"+((TextBox)e.Item.Cells[4].Controls[0]).Text+"'";

   try
   {
    CagegorySet.ExecuteUpdate(strUpdate);//需要后台提供更新的接口
    dgCategory.EditItemIndex=-1;
   }
   catch
   {
    Response.Write("<script language='javascript'>alert('未能完成更新，请…………')</script>");
   }
   BindData("PKId");
  }
private void dgCategory_DeleteCommand(object source, System.Web.UI.WebControls.DataGridCommandEventArgs e)
  {
   //获得关键字,使用DataKeys集合访问数据列表控件中每个记录的键值（显示为一行）
   //使得用户可以存储键字段而无需在控件中显示它
   string PKId=dgCategory.DataKeys[e.Item.ItemIndex];
   CategorySet.ExecuteDelete(PKId);
  }*/