private void Scanning()
{
try
{
cameraPreview.LayoutParameters.Height = 800;
cameraPreview.RequestLayout();
cameraSource.Start(cameraPreview.Holder);
Toast.MakeText(Application.Context, txtResult.Text, ToastLength.Short).Show();
}
catch (InvalidOperationException)
{
Toast.MakeText(this, "Problem", ToastLength.Long).Show();
}
}