Ciao
Aspettando che Cristian ti risponda prova questo:
Dim openFileDialog1 As New OpenFileDialog()
openFileDialog1.InitialDirectory = "C:\"
openFileDialog1.Filter = "txt files (*.txt)|*.txt|All files (*.*)|*.*"
openFileDialog1.FilterIndex = 1
openFileDialog1.RestoreDirectory = True
If openFileDialog1.ShowDialog() = System.Windows.Forms.DialogResult.OK Then
Dim path As String = openFileDialog1.FileName
Dim readText() As String = File.ReadAllLines(path)
MsgBox(readText.GetValue(5)) 'Leggo la sesta linea (0 è la prima)
End If
Ciao
alexmed