public static bool deleteSharedFieldsOfFarm(int farmId)
        {
            try
            {

                using (PDContext db2 = new PDContext())
                {
                    var fieldIds = db2.fields.Where(x => x.farm_id == farmId).Select(x => x.id).ToList();

                    foreach (var fieldId in fieldIds)
                    {
                        db2.share_permissions
                          .Where(x => x.shared_object_type_id == 3 && x.shared_object_id == fieldId)
                          .ToList().ForEach(f => f.deleted = true);
                    }

                    db2.share_permissions
                          .Where(x => x.shared_object_type_id == 2 && x.shared_object_id == farmId)
                          .ToList().ForEach(f => f.deleted = true);

                    db2.SaveChanges();
                }

                return true;
            }
            catch (Exception ex)
            {
                EmailHelper.SendErrorMail(ex);
                return false;
            }
        }