public void show()
{
LayoutInflater inflater = (LayoutInflater)Application.Context.GetSystemService(Context.LayoutInflaterService);
View npView = inflater.Inflate(Resource.Layout.dialog_numberpicker, null);
numberPicker = npView.FindViewById <NumberPicker>(Resource.Id.numberPicker1);
numberPicker.MaxValue = new DateTime().Year;
numberPicker.MinValue = 1900;
numberPicker.SetGravity(GravityFlags.Center);
numberPicker.WrapSelectorWheel = true;
numberPicker.SetScrollContainer(true);
numberPickerAlertDialog = new AlertDialog.Builder(this).SetTitle("Occupation Year").SetView(npView)
.SetPositiveButton(Resource.String.done, delegate
{
occupationYear.Text = numberPicker.Value.ToString();
numberPickerAlertDialog.Dismiss();
}).SetNegativeButton(Resource.String.cancel, delegate
{
numberPickerAlertDialog.Dismiss();
}).Create();
numberPickerAlertDialog.Show();
}