private void BookTypeTree_Load(object sender, EventArgs e)
        {
            GetGroupsBLL         bll  = new GetGroupsBLL();
            List <BookTypeGroup> list = bll.getBookTypeGroup();
            ControlLoad          load = new ControlLoad();

            //初始化树列表
            load.LoadBookTypeTree("0", this.tvSearch.Nodes[0], list);
            this.tvSearch.SelectedNode = this.tvSearch.Nodes[0];
            this.tvSearch.SelectedNode.Expand();
        }
        /// <summary>
        /// 窗体加载事件
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void Form1_Load(object sender, EventArgs e)
        {
            this.dgvBook.AutoGenerateColumns = false;
            GetGroupsBLL bll = new GetGroupsBLL();

            types = bll.getBookTypeGroup();


            //加载学生管理
            tpStudent.Controls.Clear();
            AdminForm ad = new AdminForm();

            ad.TopLevel = false;
            tpStudent.Controls.Add(ad);
            ad.Show();
        }