Ok i found this code at the link you gave me.

This function is pretty new for me.

Do i put this in a class?

Can you explain/help me how to use this ?

Code:
Imports System
Imports System.IO

Public Class MainClass

  Shared Sub Main()

    Dim nameOfDirectory As String = "C:\"
    Dim myDirectory As DirectoryInfo
    myDirectory = New DirectoryInfo(nameOfDirectory)
    WorkWithDirectory(myDirectory)

  End Sub

  Shared Public Sub WorkWithDirectory(ByVal aDir As DirectoryInfo)
    Dim nextDir As DirectoryInfo
    WorkWithFilesInDir(aDir)
    For Each nextDir In aDir.GetDirectories
      WorkWithDirectory(nextDir)
    Next
  End Sub

  Shared Public Sub WorkWithFilesInDir(ByVal aDir As DirectoryInfo)
    Dim aFile As FileInfo
    For Each aFile In aDir.GetFiles()
      Console.WriteLine(aFile.FullName)
    Next
  End Sub

  
End Class