Code:
OpenFileDialog1.ShowDialog()
For Each folder in My.Computer.FileSystem.GetDirectories(YOURFOLDERPATHHERE)
For Each dir in My.Computer.FileSystem.GetFiles(folder)
ListBox1.Items.Add(dir)
Next
Next
OpenFileDialog1.ShowDialog()
For Each folder in My.Computer.FileSystem.GetDirectories(YOURFOLDERPATHHERE)
For Each dir in My.Computer.FileSystem.GetFiles(folder)
ListBox1.Items.Add(dir)
Next
Next