private void Button_Create(object sender, RoutedEventArgs e)
        {
            var student = new Student()
            {
                FirstName = TxtFirstName.Text,
                LastName  = TxtLastName.Text,
                Major     = TxtMajor.Text
            };

            try
            {
                _bll.Create(student);
                DtgStudents.ItemsSource = _bll.GetAll();
            }
            catch (Exception exception)
            {
                MessageBox.Show($"Could not create the student. {exception.Message}");
            }
        }