VS 2017 Xamarin, open PDF file and configurating copies number

VS 2017 Xamarin, open PDF file and configurating copies number

I'm developing app with xamarin an c# and I'd like to open a pdf file and to can configurate de copies number for example copies = 2.
Thanks

my code---------------------------------------------------------

public void OpenFile(string filePath, string filename)
{
var bytes = File.ReadAllBytes(filePath);

        //Copy the private file's data to the EXTERNAL PUBLIC location
        string externalStorageState = global::Android.OS.Environment.ExternalStorageState;
        string application = "application/pdf";

        string extension = System.IO.Path.GetExtension(filePath);

        var externalPath = global::Android.OS.Environment.ExternalStorageDirectory.Path + "/" + filename + extension;
        File.WriteAllBytes(externalPath, bytes);

        Java.IO.File file = new Java.IO.File(externalPath);
        file.SetReadable(true);
        Android.Net.Uri uri = Android.Net.Uri.FromFile(file);
        Intent intent = new Intent(Intent.ActionView);
        intent.SetDataAndType(uri, application);
        intent.SetFlags(ActivityFlags.ClearWhenTaskReset | ActivityFlags.NewTask);            

        intent.SetFlags(ActivityFlags.NoHistory);
        intent.AddFlags(ActivityFlags.ClearTask);
        try
        {
            this.StartActivity(intent);
            Finish();
        }
        catch (Exception)
        {
            Toast.MakeText(this, "No hay aplicaciones instaladas para abrir PDF's", ToastLength.Short).Show();
        }
    }