private void Clear(object sender, RoutedEventArgs e)
{
T1.Clear();
T2.Clear();
T3.Clear();
T4.Clear();
T5.Clear();
T6.Clear();
T7.Clear();
T8.Clear();
T9.Clear();
T10.Clear();
T11.Clear();
T12.Clear();
T13.Clear();
T14.Clear();
T15.Clear();
T16.Clear();
T17.Clear();
}