怎样给Gridview控件的删除时添加提示？

//在 RowDataBound中写入以下代码

protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
    {
        if (e.Row.RowType == DataControlRowType.DataRow)
        {
            if (e.Row.RowState == DataControlRowState.Normal || e.Row.RowState == DataControlRowState.Alternate)
            {

                 //Cells获取删除按钮所在的列 要更具删除按钮所在的列来定，由于我的删除是采用图片

                //故强制转换成ImageButton,
                ((ImageButton)e.Row.Cells[1].Controls[0]).Attributes.Add("onclick","return confirm('确定要删除！')");
            }
        }
    }