private void loadTree()
        {
            DeptTree.Nodes.Clear();
            DataTable dt = T_bll.Dept_Tree_Static();

            DeptTree.DataSouce = dt;
            DeptTree.LoadNode("");
            DeptTree.ExpandAll();
        }
        private void loadTree()

        {
            try
            {
                DeptTree.Nodes.Clear();
                DataTable dt = bll.Dept_Tree_Static();
                DeptTree.DataSouce = dt;
                DeptTree.LoadNode("");
                DeptTree.ExpandAll();
            }
            catch (Exception ex)
            {
            }
        }