private void btnLogin_Click(object sender, RoutedEventArgs e)
        {
            var username = txtUsername.Text;
            var password = txtPassword.Password;

            if (username.Equals("admin") && password.Equals("admin"))
            {
                AdminWindow adminWindow = new AdminWindow();
                adminWindow.Show();
                Close();
            }
            else if (username.Equals("medecin") && password.Equals("medecin"))
            {
                MedecinWindow medecinWindow = new MedecinWindow();
                medecinWindow.Show();
                Close();
            }
            else if (username.Equals("prepose") && password.Equals("prepose"))
            {
                PreposeWindow preposeWindow = new PreposeWindow();
                preposeWindow.Show();
                Close();
            }
            else
            {
                MessageBox.Show("Username ou mot de passe incorrect !", "Erreur", MessageBoxButton.OK, MessageBoxImage.Error);
            }
        }
        private void btnConnecter_Click(object sender, RoutedEventArgs e)
        {
            if (txtNomUsager.Text == "med" && txtMotPasse.Password == "med" || txtNomUsager.Text == "doc" && txtMotPasse.Password == "doc")
            {
                MessageBox.Show("Bienvenue Docteur!");
                DocWindow win = new DocWindow();
                win.Top         = 200;
                win.Left        = 500;
                win.WindowStyle = WindowStyle.None;
                win.ResizeMode  = ResizeMode.NoResize;
                win.Show();
            }
            else if (txtNomUsager.Text == "prep" && txtMotPasse.Password == "prep")
            {
                MessageBox.Show("Bienvenue Préposé/e!", "Ouverture", MessageBoxButton.OK, MessageBoxImage.Exclamation);
                PrepWindow win = new PrepWindow();
                win.Top         = 50;
                win.Left        = 300;
                win.WindowStyle = WindowStyle.None;
                win.ResizeMode  = ResizeMode.NoResize;
                win.Show();
            }

            else if (txtNomUsager.Text == "admin" && txtMotPasse.Password == "admin")
            {
                MessageBox.Show("Bienvenue Administrateur!");
                AdminWindow win = new AdminWindow();
                win.Top         = 50;
                win.Left        = 300;
                win.WindowStyle = WindowStyle.None;
                win.ResizeMode  = ResizeMode.NoResize;
                win.Show();
            }
            else
            {
                MessageBox.Show("Authentification inexacte. Veuillez recommencer.");
            }
        }