[MSAccessProfessionals] Duplication of entry is not checked

Hi all,
I'm working on a form "Add New Cst". On its field Name "TripNo" and Control source is "TripNo" Format Standard, decimal places = 0
On its BeforeUpdateEvent I'm getting a Run time error '3075;
Syntax error (missing operator) in query expression 'TripNo= &
[TripNo]';
I want this message not comes and it should check for Duplicate entry, Event is:

Private Sub TripNo_BeforeUpdate(Cancel As Integer)

     Dim stLinkCriteria As String

     Dim rsc As DAO.Recordset

   'Don 't check if not on a new row

   'If Not Me.NewRecord Then Exit Sub

    stLinkCriteria = "TripNo= & [TripNo] " '"

                     Debug.Print stLinkCriteria

    

   'Check Cst table for duplicate TripNo

    If DCount("*", TripNo, stLinkCriteria) > 0 Then

 

        'Message box warning of duplication

            MsgBox "This Trip No: " & [TripNo] & " has already been entered" & vbCrLf & _

               "at" & [TripNo] & "." _

               , vbInformation, "Duplicate Entry"

 

            'Undo duplicate entry

            Me.Undo

               

            'Go to record of original TripNo

            Set rsc = Me.RecordsetClone

            rsc.FindFirst stLinkCriteria

            Me.Bookmark = rsc.Bookmark

            Set rsc = Nothing

    End If

End Sub

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Please help where is the mistake.
Thanks Khalid

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