private void Button_Click(object sender, RoutedEventArgs e)
{
Alumno a = new Alumno();
dgDatos.ItemsSource = a.buscar(TxNombre.Text);
}//buttonMethod
}//builder
private void tbModificar_Click(object sender, RoutedEventArgs e)
{
Alumno a = new Alumno(Convert.ToInt16(TxClaveU.Text), TxCorreo.Text);
int r = a.modificar(a);
}//buttonMethod