Yes I know Arjay and I thanks you for it. Just until I can under stand what I doing and what I'm looking for when I use the debugger I'm stuck. How ever I did find this and it works.

Code:
string fname = Path.GetFileNameWithoutExtension(m_Playable.SelectedItems[0].Text);
this just returns the file name and not the ext of the file. and it works. It does just what I wanted it to do.

And again thanks for your help