/// <summary>
/// Saves our settings
/// </summary>
protected void BtnSaveSettingsTouchUpInside (object sender, EventArgs e)
{
  NSUserDefaults.StandardUserDefaults.SetString (string.IsNullOrEmpty (
      this.txtUsername.Text) ? "" : this.txtUsername.Text, "username");
  NSUserDefaults.StandardUserDefaults.SetString (string.IsNullOrEmpty (
      this.txtPassword.Text) ? "" : this.txtPassword.Text, "password");
  NSUserDefaults.StandardUserDefaults.SetBool (this.swtchStaySignedin.On, "staySignedIn");
  NSUserDefaults.StandardUserDefaults.SetString (string.IsNullOrEmpty(
      this.txtFavoriteBand.Text) ? "" : this.txtFavoriteBand.Text, "favoriteBand");
}