bonsoir durant ma programmation du mon projet (emploi du temps scolaire) j'ai rencontré un probleme au niveau de ma Dataset lors du debuguage il m'affiche ce probleme "Une exception non gérée du type 'System.NullReferenceException' s'est produite dans emplois du temps1.exe

Informations supplémentaires*: La référence d'objet n'est pas définie à une instance d'un objet." au niveau du code suivant "dgdniveau.DataSource = dts.NIVEAU "
voici le code que j'ai généré
Code : Sélectionner tout - Visualiser dans une fenêtre à part
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 Private Sub professeur_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        dgdniveau.DataSource = dts.NIVEAU
 
        dgdmatiere.DataSource = dts.MATIERE
        dgsalle.DataSource = dts.SALLE
        dgdclasse.DataSource = dts.CLASSE
        lmatiere.DataSource = dts.Tables("MATIERE")
        lmatiere.DisplayMember = "LIBMATIERE"
        lmatiere.ValueMember = "CODEMATIERE"
        lpf.DataSource = dts.Tables("PROF")
        lpf.DisplayMember = "NOMPROF"
        lpf.ValueMember = "CODEPROF"
        lmatiere.DataSource = dts.Tables("MATIERE")
        lmatiere.DisplayMember = "LIBMATIERE"
        lmatiere.ValueMember = "CODEMATIERE"
        Comniveau.DataSource = dts.NIVEAU
        Comniveau.DisplayMember = "LIBNIVEAU"
        Comniveau.ValueMember = "CODENIVEAU"
        CMBNIVEAU.DataSource = dts.NIVEAU
        CMBNIVEAU.DisplayMember = "LIBNIVEAU"
        CMBNIVEAU.ValueMember = "CODENIVEAU"
        retablir(Me.gemploi)
 
    End Sub
 
    Private Sub Button11_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button11.Click
 
        'If c2.verifier(GRBPROF) = True Then
        '    s2.ajouterEnregistrement(GRBPROF, dts.PROF)
        '    Dim dr As DataRow
        '    For i As Integer = 0 To lm1.Items.Count - 1
        '        If lm1.GetSelected(i) = True Then
        '            dr = dts.PEUTENSEIGNER.NewRow
        '            dr("CODEPROF") = TXTCODEPROF.Text
        '            dr("CODEMATIERE") = lm1.SelectedValue.ToString
        '        End If
        '    Next
        '    Try
        '        dts.Tables("PEUTENSEIGNER").Rows.Add(dr)
        '    Catch ex As Exception
        '    End Try
 
        '    valider_dispo(Me.gemploi, TXTCODEPROF.Text)
        'End If
        '*****************krim
 
        TXTCODEPROF.Text = nouveau(dts.PROF, "CODEPROF")
        If c2.verifier(Me) = True Then
            If s2.ajouterEnregistrement(Me, dts.PROF) = True Then
                valider_dispoprof(TXTCODEPROF.Text, Me.gemploi)
                valider_matiere_prof(TXTCODEPROF.Text, lmatiere)
                vider_champs(Me.TXTCODEPROF, Me.TXTNBREHEUREMAX, Me.TXTNOMPROF)
                maj()
                retablir_dispo_prof(Me.gemploi)
                retablir_ckl(lmatiere)
            End If
        End If
        TXTCODEPROF.Text = nouveau(dts.PROF, "CODEPROF")
 
 
 
    End Sub
 
 
 
 
    Private Sub Button10_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button10.Click
        'If c2.verifier(GRBPROF) = True Then
        '    s2.ModifierEnregistrement(GRBPROF, dts.PROF, "CODEPROF")
 
        'End If
        '************************krim
        If c2.verifier(GRBPROF) = True Then
            s2.ModifierEnregistrement(GRBPROF, dts.PROF, "CODEPROF")
            valider_dispoprof(TXTCODEPROF.Text, Me.gemploi)
            valider_matiere_prof(TXTCODEPROF.Text, lmatiere)
            maj()
        End If
    End Sub
 
    Private Sub Button9_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button9.Click
        'If TXTCODEPROF.Text <> "" Then
        '    s2.supprimerenreg(GRBPROF, dts.PROF, "CODEPROF")
        'End If
        'supprimer
        ''''If TXTCODEPROF.Text <> "" Then
        ''''    Call suppression("PROF", CType(TXTCODEPROF.Text, Integer))
 
        ''''End If
 
        '*******************************krim
        If c2.verifier(GRBPROF) = True Then
            s2.supprimerenreg(GRBPROF, dts.PROF, "CODEPROF")
            vider_champs(Me.TXTCODEPROF, Me.TXTNBREHEUREMAX, Me.TXTNOMPROF)
            majsup()
            variables.retablir_dispo_prof(Me.gemploi)
        End If
    End Sub
 
 
    Private Sub Button12_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button12.Click
        'If TXTCODEPROF.Text <> "" Then
        '    s2.rechercherenreg(GRBPROF, dts.PROF, "CODEPROF")
 
        '    ''''
        'End If
        'affichage
        For Each DR As DataRow In dts.PROF.Rows
            If DR(0) = TXTCODEPROF.Text Then
                Try
                    TXTCODEPROF.Text = DR(0)
                    TXTNOMPROF.Text = DR(1)
                    TXTNBREHEUREMAX.Text = DR(2)
                Catch ex As Exception
 
                End Try
 
            End If
        Next
    End Sub
 
    '''MATIERE
 
    Private Sub Button16_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button16.Click
        'If TXTCODEMATIERE.Text <> "" Then
        '    s2.rechercherenreg(GRBMATIERE, dts.MATIERE, "CODEMATIERE")
        'End If
        For Each DR As DataRow In dts.MATIERE.Rows
            If DR(0) = TXTCODEMATIERE.Text Then
                Try
                    TXTCODEMATIERE.Text = DR(0)
                    txtLIBMATIERE.Text = DR(1)
                    txtTYPEMATIERE.Text = DR(2)
                Catch ex As Exception
 
                End Try
 
            End If
        Next
 
    End Sub
    'ajouter
 
    Private Sub Button15_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button15.Click
        If c2.verifier(GRBMATIERE) = True Then
            s2.ajouterEnregistrement(GRBMATIERE, dts.MATIERE)
        End If
    End Sub
    'modifier
 
    Private Sub Button14_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button14.Click
        If c2.verifier(GRBMATIERE) = True Then
            s2.ModifierEnregistrement(GRBMATIERE, dts.MATIERE, "CODEMATIERE")
        End If
    End Sub
    'supprimer
    Private Sub Button13_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button13.Click
        'If TXTCODEMATIERE.Text <> "" Then
        '    s2.supprimerenreg(GRBMATIERE, dts.MATIERE, "CODEMATIERE")
        'End If
        If TXTCODEMATIERE.Text <> "" Then
            Call suppression("MATIERE", CType(TXTCODEMATIERE.Text, Integer))
 
        End If
    End Sub
    ''''''''''''''''''''''NIVEAU
    Private Sub Button20_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button20.Click
        'If TXTCODENIVEAU.Text <> "" Then
        '    s2.rechercherenreg(GRBNIVEAU, dts.NIVEAU, "CODENIVEAU")
        'End If
        'affichage
        For Each DR As DataRow In dts.NIVEAU.Rows
            If DR(0) = TXTCODENIVEAU.Text Then
                Try
                    TXTCODENIVEAU.Text = DR(0)
                    TXTLIBNIVEAU.Text = DR(1)
 
                Catch ex As Exception
                End Try
 
            End If
        Next
    End Sub
    'ajouter
 
    Private Sub Button19_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button19.Click
        If c2.verifier(GRBNIVEAU) = True Then
            s2.ajouterEnregistrement(GRBNIVEAU, dts.NIVEAU)
        End If
    End Sub
    'modifier
 
    Private Sub Button18_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button18.Click
        If c2.verifier(GRBNIVEAU) = True Then
            s2.ModifierEnregistrement(GRBNIVEAU, dts.NIVEAU, "CODENIVEAU")
        End If
    End Sub
    'supprimer
 
    Private Sub Button17_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button17.Click
        'If TXTCODENIVEAU.Text <> "" Then
        '    s2.supprimerenreg(GRBNIVEAU, dts.NIVEAU, "CODENIVEAU")
        'End If
        If TXTCODENIVEAU.Text <> "" Then
            Call suppression("NIVEAU", CType(TXTCODENIVEAU.Text, Integer))
 
        End If
    End Sub
 
    Private Sub lbp1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles lbp30.Click, lbp25.Click, lbp20.Click, lbp15.Click, lbp10.Click, lbp5.Click, lbp29.Click, lbp28.Click, lbp27.Click, lbp24.Click, lbp23.Click, lbp22.Click, lbp26.Click, lbp21.Click, lbp19.Click, lbp18.Click, lbp17.Click, lbp14.Click, lbp13.Click, lbp12.Click, lbp16.Click, lbp11.Click, lbp9.Click, lbp8.Click, lbp7.Click, lbp4.Click, lbp3.Click, lbp2.Click, lbp6.Click, lbp1.Click
        couleur(sender)
    End Sub
 
    ''''''''''''''''''''''CLASSE
    'ajouter
 
    Private Sub Button7_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button7.Click
        If c2.verifier(grbclasse) = True Then
            s2.ajouterEnregistrement(grbclasse, dts.CLASSE)
            valider_dispo(Me.gemploi, txtCODECLASSE.Text)
        End If
        'For Each DR As DataRow In dts.NIVEAU.Rows
        '    If txtCODECLASSE.Text = DR(0) Then
        '        Try
        '            DR(0) = txtCODECLASSE.Text
        '            DR(1) = Comniveau.Text
        '            DR(2) = TXTSPECIALITE.Text
        '            DR(3) = TXTNBRHEURE.Text
        '        Catch ex As Exception
        '        End Try
 
        '    End If
        'Next
        'dts.CLASSE.Add(DR).rows()
    End Sub
    'modifier
 
    Private Sub Button6_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button6.Click
        If c2.verifier(grbclasse) = True Then
            s2.ModifierEnregistrement(grbclasse, dts.CLASSE, "CODECLASSE")
        End If
    End Sub
 
    Private Sub Button8_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button8.Click
        'If txtCODECLASSE.Text <> "" Then
        '    s2.rechercherenreg(grbclasse, dts.CLASSE, "CODECLASSE")
        'End If
        'affichage
        For Each DR As DataRow In dts.NIVEAU.Rows
            If DR(0) = txtCODECLASSE.Text Then
                Try
                    txtCODECLASSE.Text = DR(0)
                    Comniveau.Text = DR(1)
                    TXTSPECIALITE.Text = DR(2)
                    TXTNBRHEURE.Text = DR(3)
                Catch ex As Exception
                End Try
 
            End If
        Next
    End Sub
    'supprimer
 
    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        'If txtCODECLASSE.Text <> "" Then
        '    s2.supprimerenreg(grbclasse, dts.CLASSE, "CODECLASSE")
        'End If
        If txtCODECLASSE.Text <> "" Then
            Call suppression("CLASSE", CType(txtCODECLASSE.Text, Integer))
 
        End If
    End Sub
    ''''''''''''''''''''SALLE
    'ajouter
 
    Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click
        If c2.verifier(GRBSALLE) = True Then
            s2.ajouterEnregistrement(GRBSALLE, dts.SALLE)
            'valider_dispo(Me.gemploi, TXTCODESALLE.Text)
        End If
    End Sub
    'modifier
 
    Private Sub Button4_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button4.Click
        If c2.verifier(GRBSALLE) = True Then
            s2.ModifierEnregistrement(GRBSALLE, dts.SALLE, "CODESALLE")
        End If
    End Sub
    'supprimer
 
    Private Sub Button5_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button5.Click
        '    If TXTCODESALLE.Text <> "" Then
        '        s2.supprimerenreg(GRBSALLE, dts.SALLE, "CODESALLE")
        '    End If
        If TXTCODESALLE.Text <> "" Then
            Call suppression("SALLE", CType(TXTCODESALLE.Text, Integer))
        End If
    End Sub
    Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
        'If TXTCODESALLE.Text <> "" Then
        '    s2.rechercherenreg(GRBSALLE, dts.SALLE, "CODESALLE")
        'End If
        For Each DR As DataRow In dts.SALLE.Rows
            If DR(0) = TXTCODESALLE.Text Then
                Try
                    TXTCODESALLE.Text = DR(0)
                    TXTLIBSALLE.Text = DR(1)
                    TXTTYPESALLE.Text = DR(2)
                Catch ex As Exception
                End Try
            End If
        Next
    End Sub
 
 
End Class
sachant que je travail avec vb.net 2003 avec une base de donnée access 2000 et merci