Requete avec multi parametre

bonjour,

voici un bout de code :
Code:
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Try
                    Dim MyConnexion As OleDbConnection = New OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data source=" & "C:\Pointage\pointage.mdb")
                    Dim Mycommand As OleDbCommand = MyConnexion.CreateCommand()
 
                    MyConnexion.Open()
                    Mycommand.CommandText = "UPDATE [Actions] SET [nom_Action] = @nom1 WHERE [ID_Action] = (SELECT [ID_Action] FROM [Actions] WHERE [nom_Action] = @nom2)"
                    Dim nom1 As New System.Data.OleDb.OleDbParameter("@nom1", System.Data.OleDb.OleDbType.Char, 0, "@nom1")
                    Dim nom2 As New System.Data.OleDb.OleDbParameter("@nom2", System.Data.OleDb.OleDbType.Char, 0, "@nom2")
                    nom1.Value = TextBox2.Text.ToString
                    Mycommand.Parameters.Add(nom1)
                    nom2.Value = ListBox1.SelectedItem.Text.ToString
                    Mycommand.Parameters.Add(nom2)
                    MsgBox(Mycommand.CommandText)
                    Mycommand.ExecuteNonQuery()
                    MyConnexion.Close()
                    mise_a_jour_liste()
                    TextBox2.Text = ""
                Catch ex As Exception
                    MsgBox("Une exception s'est declenche, veuillez contacter le service informatique")
                End Try
Aucune erreur ne se déclenche , mais rien ne se passe ?