I am trying to validating date in visual basic 2013 but which code I wrote it cnt responsed, please help me

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VB12

i want to choose data on date parameter from access database and for i that i wrote a code but it dose not works and do not shift control to next ,pleas help me

What I have tried:

Private Sub GSTN_STRT_DT_Validating(ByVal sender As Object, ByVal e As System.ComponentModel.CancelEventArgs) Handles GSTN_STRT_DT.Validating
        If GSTN_STRT_DT.Value > Date.Now Then
            MessageBox.Show("Date cannot be AFTER today.")
            e.Cancel = True
            'dteditsbdt
        Else
            GST_FORDATE.Focus()
            GST_FORDATE.Select() : Me.Show()
        End If
    End Sub