How to correct error "Path of ilegal form"

See more:

C#2.0

C#

I am using a treeview, and I want to be able to get all the files inside a folder after I click a file inside that folder.
I am using this code:

//I am getting path has an ilegal form in the next line
//I also tried this statement inside the foreach, but with no luck
(Path.GetFullPath(Path.GetFileName(trwFileExplorer.SelectedNode.Name))))
//This was the other thing I tried

path.Text = Path.GetDirectoryName(trwFileExplorer.SelectedNode.Name);
//and I am getting the same error here inside the foreach            
            foreach (string file in Directory.GetFiles(path.Text))
                {
                    media = player.newMedia(Path.GetFullPath(Path.GetFileName(file.ToString())));
                    playlist.appendItem(media);
                    //path.Text = Path.GetFullPath(Path.GetFileName(file.ToString()));
                }

How can I fix this?
Thanks!