Transaction is not getting commit in entity framework

using (abcEntities dbContext = new abcEntities())
        {
            using (var transaction = dbContext.Database.BeginTransaction())
            {
                dbContext.USP_ResellerCustomerFile_DeleteFiles(customerId, fileId, 1);
                ResellerAndCustomerActivityDAL objCustomerActivityDAL = new ResellerAndCustomerActivityDAL();

                ResellerAndCustomerActivity objActivity = new ResellerAndCustomerActivity()
                {
                    Activity = objfile.FileName + " is temporairly permanently deleted.",//message.ReplacingSpecialCharacterswithEntities(),
                    ActivityDate = DateTime.UtcNow,
                    ResellerAndCustomerId = customerId,
                    UserTypeId = 2

                };

                dbContext.ResellerAndCustomerActivities.Add(objActivity);

                //objCustomerActivityDAL.Create(objfile.FileName + " is permanently deleted.", objUnit, out returnMessage, customerId);

                dbContext.SaveChanges();
                transaction.Commit();
            }
        }