private void AddProfessor_Click(object sender, EventArgs e)
        {
            string name  = FindViewById <EditText>(Resource.Id.dean_newProfessor_Name).Text;
            int    phone = int.Parse(FindViewById <EditText>(Resource.Id.dean_newProfessor_phone).Text);
            int    room  = int.Parse(FindViewById <EditText>(Resource.Id.dean_newProfessor_room).Text);

            if (DataBaseHelper.IsServerAlive())
            {
                DataBaseHelper.AddNewProfessor(name, phone, room);
                Toast.MakeText(this, "New professor is added!", ToastLength.Long).Show();
            }
            else
            {
                Toast.MakeText(this, "Server isn't alive", ToastLength.Long).Show();
            }
            Finish();
        }