namespace YOUserbase; public partial class LoginPage : ContentPage { public LoginPage () { InitializeComponent (); } private async void OnLoginClicked (object sender, EventArgs e) { if (UsernameEntry.Text == "admin" && UsernameEntry.Text == "admin") { Application.Current.MainPage = new AppShell (); } else { await DisplayAlert ("Error", "Invalid username or password", "OK"); } } }