private async void AddConsultant_Clicked(object sender, EventArgs e) { if (Email.Text == "") { await DisplayAlert("Warning", "You have to fill in an email.", "Ok"); } else { bool b = await companyServices.AddUserToCompanyByIdAsync(int.Parse(idCompany), Email.Text); if (b == true) { await DisplayAlert("Warning", "Email is send to consultant.", "Ok"); Application.Current.MainPage = new CompanyUserListPage(); } else { await DisplayAlert("Warning", "Email is not send because the consultant doesn't exist or is already added to this company.", "Ok"); } } }