private void ButtonUpdateTypeOfContract_Click(object sender, RoutedEventArgs e)
        {
            TypeOfContract typeOfContract = (TypeOfContract)ListTypeOfContract.SelectedItem;

            if (typeOfContract != null)
            {
                TypeOfContractWindow typeOfContractWindow = new TypeOfContractWindow(db);
                typeOfContractWindow.DataContext = typeOfContract;
                typeOfContractWindow.ShowDialog();

                if (typeOfContractWindow.DialogResult == true)
                {
                    db.SaveChanges();
                }
            }
            else
            {
                MessageBox.Show("Veuillez sélectionner un type de contrat.");
            }
        }
        private void ButtonAddTypeOfContract_Click(object sender, RoutedEventArgs e)
        {
            TypeOfContract typeOfContract = new TypeOfContract();
            TypeOfContractWindow typeOfContractWindow = new TypeOfContractWindow(db);

            typeOfContractWindow.DataContext = typeOfContract;
            typeOfContractWindow.ShowDialog();

            if (typeOfContractWindow.DialogResult == true)
            {
                TypeOfContracts.Add(typeOfContract);
                db.TypeOfContract.Add(typeOfContract);

                db.SaveChanges();
            }
        }