private async void BtnAdd_Clicked(object sender, EventArgs e)
{
//await firebaseManager.AddPerson(Convert.ToInt32(txtId.Text), txtName.Text);
var takenData = await firebaseManager.GetSelectedPerson(1);
txtId.Text = string.Empty;
txtName.Text = string.Empty;
await DisplayAlert("Success", "Person Added Successfully", "OK");
var allPersons = await firebaseManager.GetAllPersons();
lstPersons.ItemsSource = allPersons;
}
