private void btn_delete_Click(object sender, EventArgs e)
        {
            if (MessageBox.Show("Would you like to delete the Data of : " + serv.NomDuMois(dateTimePicker1.Value.Month), "Attention", MessageBoxButtons.OKCancel, MessageBoxIcon.Question) == DialogResult.OK)
            {
                int mois  = dateTimePicker1.Value.Month;
                int annee = dateTimePicker1.Value.Year;
                if (RefSoc == 2)
                {
                    if (serv.Delete_GrossToNet("GROSSTONETA001", RefSoc, mois, annee) == true)
                    {
                        MessageBox.Show("Delete realised with success");
                    }
                    else
                    {
                        MessageBox.Show(" Error while delete this rubric ", "Erreur", MessageBoxButtons.OK, MessageBoxIcon.Error);
                    }
                }
                if (RefSoc == 5)
                {
                    if (serv.Delete_GrossToNet("GROSSTONETA002", RefSoc, mois, annee) == true)
                    {
                        MessageBox.Show("Delete realised with success");
                    }
                    else
                    {
                        MessageBox.Show(" Error while delete this rubric ", "Erreur", MessageBoxButtons.OK, MessageBoxIcon.Error);
                    }
                }
                if (RefSoc == 8)
                {
                    if (serv.Delete_GrossToNet("GROSSTONETA003", RefSoc, mois, annee) == true)
                    {
                        MessageBox.Show("Delete realised with success");
                    }
                    else
                    {
                        MessageBox.Show(" Error while delete this rubric ", "Erreur", MessageBoxButtons.OK, MessageBoxIcon.Error);
                    }
                }

                if (RefSoc == 7)
                {
                    if (serv.Delete_GrossToNet("GROSSTONETA004", RefSoc, mois, annee) == true)
                    {
                        MessageBox.Show("Delete realised with success");
                    }
                    else
                    {
                        MessageBox.Show(" Error while delete this rubric ", "Erreur", MessageBoxButtons.OK, MessageBoxIcon.Error);
                    }
                }

                if (RefSoc == 9)
                {
                    if (serv.Delete_GrossToNet("GROSSTONETA010", RefSoc, mois, annee) == true)
                    {
                        MessageBox.Show("Delete realised with success");
                    }
                    else
                    {
                        MessageBox.Show(" Error while delete this rubric ", "Erreur", MessageBoxButtons.OK, MessageBoxIcon.Error);
                    }
                }

                if (RefSoc == 10)
                {
                    if (serv.Delete_GrossToNet("GROSSTONETA011", RefSoc, mois, annee) == true)
                    {
                        MessageBox.Show("Delete realised with success");
                    }
                    else
                    {
                        MessageBox.Show(" Error while delete this rubric ", "Erreur", MessageBoxButtons.OK, MessageBoxIcon.Error);
                    }
                }

                if (RefSoc == 3)
                {
                    if (serv.Delete_GrossToNet("GROSSTONETA014", RefSoc, mois, annee) == true)
                    {
                        MessageBox.Show("Delete realised with success");
                    }
                    else
                    {
                        MessageBox.Show(" Error while delete this rubric ", "Erreur", MessageBoxButtons.OK, MessageBoxIcon.Error);
                    }
                }

                if (RefSoc == 11)
                {
                    if (serv.Delete_GrossToNet("GROSSTONETA013", RefSoc, mois, annee) == true)
                    {
                        MessageBox.Show("Delete realised with success");
                    }
                    else
                    {
                        MessageBox.Show(" Error while delete this rubric ", "Erreur", MessageBoxButtons.OK, MessageBoxIcon.Error);
                    }
                }

                if (RefSoc == 12)
                {
                    if (serv.Delete_GrossToNet("GROSSTONETA015", RefSoc, mois, annee) == true)
                    {
                        MessageBox.Show("Delete realised with success");
                    }
                    else
                    {
                        MessageBox.Show(" Error while delete this rubric ", "Erreur", MessageBoxButtons.OK, MessageBoxIcon.Error);
                    }
                }
                if (RefSoc == 4)
                {
                    if (serv.Delete_GrossToNet("GROSSTONETA020", RefSoc, mois, annee) == true)
                    {
                        MessageBox.Show("Delete realised with success");
                    }
                    else
                    {
                        MessageBox.Show(" Error while delete this rubric ", "Erreur", MessageBoxButtons.OK, MessageBoxIcon.Error);
                    }
                }

                if (RefSoc == 13)
                {
                    if (serv.Delete_GrossToNet("GROSSTONETA016", RefSoc, mois, annee) == true)
                    {
                        MessageBox.Show("Delete realised with success");
                    }
                    else
                    {
                        MessageBox.Show(" Error while delete this rubric ", "Erreur", MessageBoxButtons.OK, MessageBoxIcon.Error);
                    }
                }

                if (RefSoc == 14)
                {
                    if (serv.Delete_GrossToNet("GROSSTONETA021", RefSoc, mois, annee) == true)
                    {
                        MessageBox.Show("Delete realised with success");
                    }
                    else
                    {
                        MessageBox.Show(" Error while delete this rubric ", "Erreur", MessageBoxButtons.OK, MessageBoxIcon.Error);
                    }
                }
            }
        }