private async void lstItemSelected(object sender, SelectedItemChangedEventArgs e)
{
var selected = (Student)e.SelectedItem;
var accepted = await DisplayAlert(selected.Name, "Silinsin mi?", "Evet", "Vazgeç");
if (accepted)
{
SQLiteClient _client = new SQLiteClient();
_client.Delete(selected.Id);
}
BindingContext = new StudentViewModel();
}