[Débutant] Probleme de requete "modifier"

bonsoir a vous, s'il vous plait, j'aimerais coder mon bouton "MODIFIER", et quand je compile cela m'affiche cette erreur. sur image; et voici le code:

Code:

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Private Sub btnmodif_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnmodi.Click
        Dim c As OleDbConnection = New OleDbConnection
        c.ConnectionString = chain
        c.Open()
        Dim requet As String = "UPDATE specialite SET n_qtier=[n_qtier] WHERE idqtier=[idqtier]"
        Dim req As OleDbCommand = New OleDbCommand
        req.Connection = c
        req.CommandText = requet
        Dim resp As Integer = req.ExecuteNonQuery()
        If (resp <> 0) Then
            MsgBox("Quartier modifié abvec success")
            c.Close()
            charge()
        End If
    End Sub