C#

return (XProcess)tp[0];

return new XProcess(tp[0]);

private void btnStart_Click(object sender, EventArgs e)
{
    backgroundWorker1.RunWorkerAsync();
}

private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e)
{
    [..do some work..]

    // When done, return the value. 
    e.Result = "Hello world from backgroundworker";
}

private void backgroundWorker1_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
{
    // Here you get the returnvalue from the thread, and you
    // can use it in your Form1-thread :)
    string returnValue = (string)e.Result;
}

I are troll