// This is NOT best-practice code, just showing a demo of an Jcifs api call
public async Task getFileContents ()
{
    await Task.Run (() => {
        var smbStream = new SmbFileInputStream ("smb://guest@10.10.10.5/code/test.txt");
        byte[] b = new byte[8192];
        int n;
        while ((n = smbStream.Read (b)) > 0) {
            Console.Write (Encoding.UTF8.GetString (b).ToCharArray (), 0, n);
        }
        Button button = FindViewById<Button> (Resource.Id.myButton);
        RunOnUiThread(() => {
            button.Text = Encoding.UTF8.GetString (b);
        });
    }
    ).ContinueWith ((Task arg) => {
        Console.WriteLine (arg.Status);
        if (arg.Status == TaskStatus.Faulted)
            Console.WriteLine (arg.Exception);
    }
    );
}