protected void btnDelete_Click(object sender, EventArgs e)
        {
            TopicBll qbll = new TopicBll();

            qbll.Delete(int.Parse(this.lblTopicId.Text));
            Response.Redirect("TopicList.aspx");
        }
        protected void gvList_RowCommand(object sender, GridViewCommandEventArgs e)
        {
            int      topicId = Convert.ToInt32(e.CommandArgument);
            TopicBll tbll    = new TopicBll();

            if (e.CommandName == "del")
            {
                tbll.Delete(topicId);
                this.BindList();
            }
            else if (e.CommandName == "toggle")
            {
                tbll.ToggleStatus(topicId);
                this.BindList();
            }
        }