private void ShowData()
        {
            this.listViewPhancong.Items.Clear();
            List <ClassNhanVien> lstnv = NhanVienController.GetListNvien();

            string displaycvGiao      = "";
            string displaycvHoanThanh = "";

            foreach (var i in lstnv)
            {
                displaycvGiao      = "";
                displaycvHoanThanh = "";
                foreach (var j in i.listCVLam)
                {
                    displaycvGiao = displaycvGiao + j + " ";
                }
                foreach (var j in i.listCVXong)
                {
                    displaycvHoanThanh = displaycvHoanThanh + j + " ";
                }

                ListViewItem nv = new ListViewItem(i.MaNV);

                nv.SubItems.Add(new ListViewItem.ListViewSubItem(nv, displaycvGiao));
                nv.SubItems.Add(new ListViewItem.ListViewSubItem(nv, displaycvHoanThanh));
                nv.SubItems.Add(new ListViewItem.ListViewSubItem(nv, i.TienDo));
                nv.SubItems.Add(new ListViewItem.ListViewSubItem(nv, i.MaDA));
                this.listViewPhancong.Items.Add(nv);
            }
        }