private void ChangeButton_Click(object sender, RoutedEventArgs e) { var Window = new AddStudentWindow(); Student SelectedStudent = null; var SelectedStudents = StudentsDataGrid.SelectedItems; if (SelectedStudents.Count == 0) { MessageBox.Show("Nie wybrano żadnego studenta!"); return; } else if (SelectedStudents.Count > 1) { MessageBox.Show("Wybrano zbyt wielu studentów!"); return; } else { SelectedStudent = (Student)StudentsDataGrid.SelectedItem; } Window.Open(ListaStudentow, SelectedStudent); }
private void AddButton_Click(object sender, RoutedEventArgs e) { var Window = new AddStudentWindow(); Window.Open(ListaStudentow, null); }