在Repeater1 FootTemplate模板中查找控件

protected void rpt_ItemCreated(Object sender, RepeaterItemEventArgs e)
{
     if(e.Item.ItemType == ListItemType.Footer)
          Label lbl = (Label)e.Item.FindControl("myLabel");
}

or

Label lbl = (Label)Repeater1.Controls[Repeater1.Controls.Count-1].FindControl("myLabel");