I have a RichTextBox control in a C# application.  I am going through a loop
that spawns processes and outputs data to the richtextbox before and after
each spawn occurs.  The odd thing is is that the rich text box is not being
updated till after the looping of spawned processes occurs.

I've got code a routine that does the following:
public void OutputString(string str)
{
    richTextBox.AppendText(str);
}

I would expect this to simply update my richTextBox control each time it is
invoked, but the update of the control doesn't occur till the very end of
looping of spawned controls.

I've even added the line richTextBox.Refresh() immediately after the
AppendText line but to no avail.  Any suggestions on how to force the
RichTextBox control to update itself?