private void Button_Click_1(object sender, RoutedEventArgs e) { if (surname.Text == string.Empty) { MessageBox.Show("Surname can`t be empty!!!"); } else { DatabaseWorker.NewCard(name.Text, surname.Text, fathername.Text, gender.Text, mobphone.Text, homephone.Text, workphone.Text, birth.SelectedDate.ToString(), descr.Text); Clear(); var t = from TabItem el in MainWindow.Pager.Items where (el.Content as Frame).Content == this select el; MainWindow.Pager.Items.Remove(t.First()); } }