private void _addProfessorButton_Click(object sender, EventArgs e)
        {
            errorHandlingFunctions newerror = new errorHandlingFunctions();
            var profName  = FindViewById <EditText>(Resource.Id.professorsNameAdd);
            var profPhone = FindViewById <EditText>(Resource.Id.professorsPhoneAdd);
            var profEmail = FindViewById <EditText>(Resource.Id.professorEmailAdd);
            var profId    = FindViewById <EditText>(Resource.Id.professorId);
            int profIdInt;
            ProfessorRepository newRepository = new ProfessorRepository();
            Instructor          temp          = new Instructor();

            if (profId.Text.Trim() == "")
            {
                Toast.MakeText(this, "Please add an Id", ToastLength.Short).Show(); return;
            }
            else
            {
                profIdInt = int.Parse(profId.Text);
            }
            //temp.Id = int.Parse(FindViewById<EditText>(Resource.Id.professorId).Text);
            foreach (Instructor item in thisProfList)
            {
                if (profIdInt == item.Id)
                {
                    Toast.MakeText(this, "Id already in use", ToastLength.Short).Show();
                    return;
                }
            }
            temp.Id = profIdInt;
            if (profName.Text.Trim() != "")
            {
                temp.Name = profName.Text;
            }
            else
            {
                Toast.MakeText(this, "Please add a valid name", ToastLength.Short).Show(); return;
            }
            if (profPhone.Text.Length == 10)
            {
                temp.PhoneNumber = profPhone.Text;
            }
            else
            {
                Toast.MakeText(this, "Please add a 10 digit number, including area code. No spaces or symbols", ToastLength.Short).Show(); return;
            }
            if (newerror.validEmail(profEmail.Text) == true)
            {
                temp.Email = profEmail.Text;
            }
            else
            {
                Toast.MakeText(this, "Please add a valid email", ToastLength.Short).Show(); return;
            }
            newRepository.AddProfessor(temp);
            _professorAdapter.AddToProfessors(temp);
            _professorAdapter.NotifyDataSetChanged();
            thisProfList.Add(temp);
            thisProfString = new List <string>();
            thisProfString = setProfSpinner();
            var adapter           = new ArrayAdapter <string>(this, Android.Resource.Layout.SimpleSpinnerItem, thisProfString);
            var spinnerProfDelete = FindViewById <Spinner>(Resource.Id.ProfessorDeleteSpinner);
            var profSpinnerEdit   = FindViewById <Spinner>(Resource.Id.professorIdEdit);

            spinnerProfDelete.Adapter = adapter;
            profSpinnerEdit.Adapter   = adapter;
            var ProfName        = FindViewById <EditText>(Resource.Id.professorsNameAdd);
            var ProfPhoneNumber = FindViewById <EditText>(Resource.Id.professorsPhoneAdd);
            var ProfEmail       = FindViewById <EditText>(Resource.Id.professorEmailAdd);
            var ProfId          = FindViewById <EditText>(Resource.Id.professorId);

            ProfName.Text        = "";
            ProfPhoneNumber.Text = "";
            ProfEmail.Text       = "";
            ProfId.Text          = "";
        }