async void BookBtn_Click(object sender, EventArgs e) { description = descriptionTV.Text; dateString = dateTV.Text; foreach (Booking booking in band.Bookings) { if (booking.Date.ToString("yyyy-MM-dd") == dateString) { Toast.MakeText(this, "Sorry, this artist is not available in the date you selected", ToastLength.Long).Show(); return; } } int result = await MusicoConnUtil.AddBooking(description, Convert.ToDateTime(dateString), userId, band.Id); if (result < 0) { Toast.MakeText(this, "An error has ocurred, please try again", ToastLength.Short).Show(); return; } Toast.MakeText(this, "You have booked this artist!", ToastLength.Long).Show(); Intent intent = new Intent(this, typeof(HomeActivity)); intent.PutExtra("id", userId); StartActivity(intent); Finish(); }