Help Me Is't Correct Codes for 60 Days Validation for Application

Hello :wave:
i am creating a class for only 60 days working my application but i don't know that is correct code,
please help me:wave:
Thanks....

Code:

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Public Class ClassTrialVersion
 Implements IDisposable

#Region "Constructor"
    Public _onceCatchTrailExpiredMsg As Boolean = False
    Public Sub New(ByVal _softwareInitialDate As Date)
        Try
            Dim _msgs$ = Nothing
            Dim _ethanaiYeariruku% = 0
            Dim _ethanaiMonthIruku% = 0
            Dim _ethanaiDaysIruku% = 0

            '------------------YearCompare----------------------------------
            'Rendu Date kkum Ethanai YEAR difference ikku nnu check pannrean
            _ethanaiYeariruku% = DateDiff(DateInterval.Year, _softwareInitialDate, Now.Date) '1 Year iruntha Ok [Dec2010 - Jan2011]
            Select Case _ethanaiYeariruku
                Case Is < 0 'Year
                    _onceCatchTrailExpiredMsg = True
                    _msgs$ = "Trial Expired" & vbCrLf & "Please Purchase this Software : #10001"
                    MsgBox(_msgs$, MsgBoxStyle.Critical, "Beta Test")
                    End
                Case Is > 1 'Year
                    _onceCatchTrailExpiredMsg = True
                    _msgs$ = "Trial Expired" & vbCrLf & "Please Purchase this Software : #10002"
                    MsgBox(_msgs$, MsgBoxStyle.Critical, "Beta Test")
                    End

                Case 0, 1 'Year
                    'Months
                    _ethanaiMonthIruku% = DateDiff(DateInterval.Month, _softwareInitialDate, Now.Date) '1 Year iruntha Ok [Dec2010 - Jan2011]
                    Select Case _ethanaiMonthIruku
                        Case Is < 0 'month if minus value
                            _onceCatchTrailExpiredMsg = True
                            _msgs$ = "Trial Expired" & vbCrLf & "Please Purchase this Software : #10003"
                            MsgBox(_msgs$, MsgBoxStyle.Critical, "Beta Test")
                            End
                        Case Is >= 2 'month
                            _ethanaiDaysIruku = DateDiff(DateInterval.Day, _softwareInitialDate, Now.Date) '1 Year iruntha Ok [Dec2010 - Jan2011]
                            If _ethanaiDaysIruku > 60 Then
                                _onceCatchTrailExpiredMsg = True
                                _msgs$ = "Trial Expired" & vbCrLf & "Please Purchase this Software : #10004"
                                MsgBox(_msgs$, MsgBoxStyle.Critical, "Beta Test")
                                End
                            End If
                    End Select
                    'Days
                    _ethanaiDaysIruku% = DateDiff(DateInterval.Day, _softwareInitialDate, Now.Date) '1 Year iruntha Ok [Dec2010 - Jan2011]
                    Select Case _ethanaiDaysIruku%
                        Case Is < 0
                            _onceCatchTrailExpiredMsg = True
                            _msgs$ = "Trial Expired" & vbCrLf & "Please Purchase this Software : #10005"
                            MsgBox(_msgs$, MsgBoxStyle.Critical, "Beta Test")
                            End
                        Case Is > 60 'days
                            _onceCatchTrailExpiredMsg = True
                            _msgs$ = "Trial Expired" & vbCrLf & "Please Purchase this Software : #10006"
                            MsgBox(_msgs$, MsgBoxStyle.Critical, "Beta Test")
                            End
                    End Select
            End Select


            Dim _methamullaDathi% = 60 - DateDiff(DateInterval.Day, _softwareInitialDate, Now.Date)
            ' MsgBox("Days Remaining : " & 60 - _methamullaDathi%) '1 Year iruntha Ok [Dec2010 - Jan2011]
            If _methamullaDathi < 0 Then
                _onceCatchTrailExpiredMsg = True
                _msgs$ = "Trial Expired" & vbCrLf & "Please Purchase this Software : #10007"
                MsgBox(_msgs$, MsgBoxStyle.Critical, "Beta Test")
                End
            End If

        Catch ex As Exception
            MsgBox(ex.ToString)
        End Try
    End Sub

End Class


 Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        Dim _clsTrialInitialize As New ClassTrialVersion(dtpck1.Value.Date)
    End Sub

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Test it. Install it then advance the date.

@med - you do know that this won't stop anyone who wants to bypass / disable your checks.