TextBox's in .Net

I'm trying to figure something out about this, and having a little trouble, so I figured  I'm make an entry about it.  Hopefully, I'll get lucky and someone who knows the answer will grace my blog with their presence.  ;)

So I have a form with a TextBox that I'm setting the Text property equal to the string return value of a method that builds a large string for me.  The text does get set perfectly and I have no problems with what the value is.  My problem is that it's always selected...the whole TextBox's string value is highlighted.  I would like for it not to be...

I've been trying to do TextBox.SelectedText = string.Empty;   and that didn't work.  I tried setting focus to the form and that didn't work...

I'll keep messing around, but if anyone can give me a pointer on this I'd be ever so grateful.  :)