[RESOLVED] The proper way to retrieve file names from a path?

[Louix]

Hi, I'm using this to retrieve a file name from a path:

Dim fullPath As String = TextBox1.Text
Dim fileName As String = IO.Path.GetFileName(fullPath)

However, when I put it to use using something like this:

IO.File.Copy(TextBox1.Text, ListBox1.SelectedItem.ToString + "PSP\THEME\" + fileName)

I get the 'NullReferenceException' error Can somebody help me with this?

I'm sure it's just something I'm missing.