private void BoutonNewContact_Click(object sender, RoutedEventArgs e) { BLL.BLL BLL_AddContact = new BLL.BLL(); if (NewContactFirtsName.Text.Trim().CompareTo("") != 0 || NewContactSecondName.Text.Trim().CompareTo("") != 0 || NewContactEmail.Text.Trim().CompareTo("") != 0 || NewContactPhone.Text.Trim().CompareTo("") != 0 || NewContactAge.Text.Trim().CompareTo("") != 0) { BLL_AddContact.AddNewContact(NewContactFirtsName.Text, NewContactSecondName.Text, NewContactEmail.Text, NewContactPhone.Text, NewContactAge.Text); NewContactFirtsName.Text = ""; NewContactSecondName.Text = ""; NewContactEmail.Text = ""; NewContactPhone.Text = ""; NewContactAge.Text = ""; addContactMessage.Content = "Contact insert"; } else { addContactMessage.Content = "Insert new contact informations"; } }