动态点击事件是'；t在C#中点火

我正在用SQLDataReader中的数据填充页面中的PlaceHolder。我可以从数据库中获取所有数据，但当我试图将单击事件添加到动态链接按钮时，它甚至不会启动。我试过把代码放在PreInit和Init函数中，但一点也没有。非常感谢！

这是我的代码：

protected void Page_Load(object sender, EventArgs e)
{
   InsertRotatorIntoSQL selectGroups = new InsertRotatorIntoSQL();
   SqlConnection conn = selectGroups.Connection();
   string groupCmd = "SELECT g.GroupID, g.GroupName, g.GroupDescription, i.ImgName FROM dbo.ImageGalleryGroups g INNER JOIN dbo.ImageGalleryImages i on i.GroupID=g.GroupID WHERE i.IsThumbnail=1";
   SqlCommand getGroupCmd = new SqlCommand(groupCmd, conn);
   conn.Open();
   SqlDataReader sdr = getGroupCmd.ExecuteReader();
   while (sdr.Read())
   {
        string id = sdr.GetValue(0).ToString();
        string name = sdr.GetValue(1).ToString();
        string desc = sdr.GetValue(2).ToString();
        string img = sdr.GetValue(3).ToString();
        Literal containerDiv = new Literal();
        containerDiv.Text = "<div style='float:left; margin:0 5px;'>";
        PlaceHolder1.Controls.Add(containerDiv);
        Literal t = new Literal();
        t.Text = "<h3>" + name + "</h3>";
        PlaceHolder1.Controls.Add(t);
        Image gThumb = new Image();
        gThumb.Width = 150;
        //todo implement css  border:1px solid #eee; padding:2px;
        gThumb.ImageUrl = "/App_Templates/Skin_1/ImageGalleryGroups/" + name + "/" + img;
        PlaceHolder1.Controls.Add(gThumb);
        Literal br = new Literal();
        br.Text = "<br /><p> ";
        PlaceHolder1.Controls.Add(br);
        LinkButton del = new LinkButton();
        del.Click += new EventHandler(this.Delete_Group);
        del.Text = "Delete";
        del.CssClass = "delbtn";
        PlaceHolder1.Controls.Add(del);
        Literal d = new Literal();
        //create editgroup
        d.Text = " | <a href='ViewGroup.aspx?GroupID=" + id + "'>Edit</a></p>";
        PlaceHolder1.Controls.Add(d);
        Literal cdClose = new Literal();
        cdClose.Text = "</div>";
        PlaceHolder1.Controls.Add(cdClose);         
    }
}