public async void ValidateUser() { Login login = new Login(); login.UserName = UserName; login.Password = Password; AuthClient.Login = new Models.Login { Login1 = UserName.Text, Password = Password.Text }; AuthClient.SetProperties(); var s = await AuthClient.AuthorizationClient(); if (s == true) { Application.Current.MainPage = new MainPage(); } else { await DisplayAlert("Wrong password", "Incorrrect password", "cancel"); } }