validation zone

static void accessValidation()
        {
            var accessListe = ACCESS_Page.Columns[0].ExistingCells.ToArray();
            var cells = MPD_Page.Columns[4].ExistingCells.ToArray();
            var zonesListes = MPD_Page.Columns[6].ExistingCells.ToArray();
            string[] accessValue = new string[accessListe.Length];

            for (int i = 0; i < accessListe.Length; i++)
            {
                accessValue[i] = accessListe[i].Value.ToString();

            }


            string indice = "";

            for (int i = 1; i < cells.Length; i++)
            {
                indice = "E" + (i + 1).ToString();
                bool notFound = false;
                string[] ligneAccess , zones ;
                string[] access;
                string[] cellAccessValues , cellAccessValuesReversed;

                if (cells[i].Value.ToString() == "")
                {
                    continue;
                }

                zones = zonesListes[i].Value.ToString().Split('\n');
                ligneAccess = cells[i].Value.ToString().Split('\n');

                if (zones.Length < ligneAccess.Length)
                {
                    MPD_Page.Cells[indice].FillColor = Color.Red;
                    continue;

                }
                cellAccessValues = cells[i].Value.ToString().Replace('\n', ';').Split(';');
                cellAccessValuesReversed = cells[i].Value.ToString().Replace('\n', ';').Split(';');
                Array.Reverse(cellAccessValuesReversed);


                foreach (var itemligne in ligneAccess)
                {

                    if (itemligne != "") {
                    access = itemligne.Split(';');
                    foreach (var itemaccess in access)
                    {

                       if (Array.IndexOf(accessValue, itemaccess)== -1 || (Array.IndexOf(cellAccessValues, itemaccess) != (cellAccessValues.Length - Array.IndexOf(cellAccessValuesReversed, itemaccess)) - 1))
                        {
                            notFound = true;
                            MPD_Page.Cells[indice].FillColor = Color.Red;
                            break;
                        }
                    }
                    if (notFound)
                    {
                        break;
                    }
                }



                }



            }
        }