private void Admin_StatisticalPage_Loaded(object sender, RoutedEventArgs e)
{
ws = new kidmathwebserviceSoapClient();
List <khoaHoc> dskhoahoc = new List <khoaHoc>();
dskhoahoc = ws.getDataKhoaHocAsync().Result.Body.getDataKhoaHocResult.ToList <khoaHoc>();
dskhoahoc = dskhoahoc.FindAll(kh => kh.maKhoaHoc != "");
adpage_statistical_dskhoahoc.ItemsSource = dskhoahoc;
ws = new kidmathwebserviceSoapClient();
soLuongNguoiDung.Text = ws.checkExistsAsync("select * from nguoiDung").Result.Body.checkExistsResult.ToString();
ws = new kidmathwebserviceSoapClient();
soLuongKhoaHocDaBan.Text = ws.checkExistsAsync("select * from muaKhoaHoc").Result.Body.checkExistsResult.ToString();
ws = new kidmathwebserviceSoapClient();
tongSoTienNguoiDungNap.Text = ws.doanhthu_functAsync().Result.ToString();
ws = new kidmathwebserviceSoapClient();
tongSoTienNguoiDungSuDung.Text = (Convert.ToInt32(tongSoTienNguoiDungNap.Text) - ws.nguoidungchi_functAsync().Result).ToString();
}