private void ListView_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            switch (((ListViewItem)((ListView)sender).SelectedItem).Name)
            {
            case "btn_ThongTinHS":
                UserControls_UI.QuanLyHS_UserControl quanLyHS_UserControl = new QuanLyHS_UserControl();
                this.Grid_PersonControls.Children.Add(quanLyHS_UserControl);
                break;

            case "btn_NhapDiem":
                UserControls_UI.QuanLyDiem_UserControl bangDiem_UserControl = new QuanLyDiem_UserControl();
                this.Grid_PersonControls.Children.Add(bangDiem_UserControl);
                break;

            case "btn_CapNhatThongTin":
                UserControls_UI.CapNhat_UserControl capNhat_UserControl = new CapNhat_UserControl();
                this.Grid_PersonControls.Children.Add(capNhat_UserControl);
                break;

            case "btn_PhanLopHoc":
                UserControls_UI.QuanLyLop_UserControl quanLyLop_UserControl = new QuanLyLop_UserControl();
                this.Grid_PersonControls.Children.Add(quanLyLop_UserControl);
                break;

            case "btn_PhanCong":
                MessageBox.Show("PhanCong");
                break;

            case "btn_QuyDinh":
                Controls_UI.QuyDinh_Window quyDinh_Window = new QuyDinh_Window();
                quyDinh_Window.ShowDialog();
                break;

            case "btn_GiaoVien":
                NguoiDung_UserControl nguoiDung_UserControl = new NguoiDung_UserControl();
                this.Grid_PersonControls.Children.Add(nguoiDung_UserControl);
                break;

            case "btn_ThongKe":
                ThongKeHK_UserControl thongKeHK_UserControl = new ThongKeHK_UserControl();
                this.Grid_PersonControls.Children.Add(thongKeHK_UserControl);
                break;
            }
        }
 private void Window_Loaded(object sender, RoutedEventArgs e)
 {
     this.box_TenNguoiDung.Text = "Xin chào: " + this.str_TenNguoiDung;
     UserControls_UI.QuanLyHS_UserControl quanLyHS_UserControl = new QuanLyHS_UserControl();
     this.Grid_PersonControls.Children.Add(quanLyHS_UserControl);
 }