Private lofi As List(Of IO.FileInfo)
 
    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As _
      System.EventArgs) Handles MyBase.Load
        Dim di As New IO.DirectoryInfo("C:\windows")
        lofi = New List(Of IO.FileInfo)(di.GetFiles())
        ListBox1.DataSource = lofi
        ListBox1.DisplayMember = "Name"
    End Sub
 
    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As _
      System.EventArgs) Handles Button1.Click
        Dim res = (From fi As IO.FileInfo In lofi Where fi.Attributes And _
        IO.FileAttributes.System Select fi).ToList
        ListBox2.DataSource = res
        ListBox2.DisplayMember = "Name"
    End Sub

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