How do I use Expire date in windows Application.

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VB

C#3.5

How do I Use an Expire date code in Windows Applications, and The application must close after the expire date and the application does not work even though when the user changes system date to previous date. Please anyone help me out of this problem.

I used this vb.net code for my Windows Application, but if I change the system date then application will run.

[CODE]

Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load

Dim dateFile As String = "\Data.txt"
Dim filePath As String = My.Computer.FileSystem.SpecialDirectories.Programs
Dim fullPathAndFilename As String = filePath & dateFile

Dim dateFromFile As Date
Dim ts As TimeSpan


If System.IO.File.Exists(fullPathAndFilename) = True Then

Using sr As New System.IO.StreamReader(fullPathAndFilename)

Date.TryParse(sr.ReadLine, dateFromFile)

ts = Now.Subtract(dateFromFile)

If ts.TotalDays > 1 Then
Dim result As DialogResult = MessageBox.Show("Software trial expired, sorry.")
If result = Windows.Forms.DialogResult.OK Or result = Windows.Forms.DialogResult.Cancel Then
sr.Close()
End
End If
Else

End If
sr.Close()
End Using

ElseIf System.IO.File.Exists(fullPathAndFilename) = False Then
Using sw As New System.IO.StreamWriter(fullPathAndFilename)
sw.WriteLine(Now.ToLongDateString & " " & Now.ToLongTimeString)
sw.Close()
End Using
End If

End Sub
[/CODE]

Thanks and Regards
BASVA.