private void newEntryBtn_Click(object sender, EventArgs e)
        {
            Boat boat = new Boat();

            WriteDetailsInBoat(boat);
            BoatsList.Add(boat);
            boatsFormList.SelectedIndex = BoatsList.Count() - 1;
        }
 private void OnListChanged(object sender, ListChangedEventArgs e)
 {
     if (BoatsList.Count() > 0)
     {
         deleteEntryBtn.Enabled = true;
     }
     else
     {
         deleteEntryBtn.Enabled = false;
     }
 }
 private void deleteEntryBtn_Click(object sender, EventArgs e)
 {
     if (BoatsList.Count() > 0)
     {
         var confirmResult = MessageBox.Show("Wollen Sie diesen Eintrag wirklich löschen?", "Löschbestätigung", MessageBoxButtons.YesNo);
         if (confirmResult == DialogResult.Yes)
         {
             BoatsList.Remove((Boat)boatsFormList.SelectedItem);
         }
     }
 }