async void login(string email, string pass) { Core.PostonServer poston = new Core.PostonServer(); var login = poston.PostLogin(email, pass, "loginREST"); var result = await login; if (result == "Aluno") { await Navigation.PushAsync(new MainPage2()); } else if (result == "Login Errado") { //LOGIN ERRADO } else if (result == "ROOT") { await Navigation.PushAsync(new MainPage_Admin()); } else { await Navigation.PushAsync(new MainPage_Prof()); } }