private void DeleteJob(SPFeatureReceiverProperties properties)
        {
            SPSecurity.RunWithElevatedPrivileges(delegate () {
                SPSite site = properties.Feature.Parent as SPSite;

                // delete the job
                site.WebApplication.JobDefinitions.Where(t => t.Name.Equals(jobName)).ToList().ForEach(j => j.Delete());
            });
        }