Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim files = From file In My.Computer.FileSystem.GetFiles(Application.StartupPath) Order By file Ascending
Dim i As Integer
For i = 0 To files.Count - 1
ListBox1.Items.Add(files(i))
Next
End Sub