private void signInButton_Click(object sender, RoutedEventArgs e)
        {
            vm_Login v = new vm_Login();

            if (v.Login(userNameTextBox.Text, passwTextBox.Password))
            {
                this.Close();
            }
            else
            {
                MessageBox.Show("Wrong Password or Username");
            }
        }
 public LoginScreen()
 {
     DataContext = new vm_Login();
     InitializeComponent();
 }