Timer job not listed in Timer Job Definitions   Sharepoint 2007
public override void FeatureActivated(SPFeatureReceiverProperties properties)
        {
            try
            {
                SPSecurity.RunWithElevatedPrivileges(delegate()
                {
                    SPWeb parentWeb = properties.Feature.Parent as SPWeb;
                    UpdateEmpReferralListTimer taskJob;
                    SPMinuteSchedule schedule;
                    foreach (SPJobDefinition job in parentWeb.Site.WebApplication.JobDefinitions)
                    {

                        if (job.Name == "xyz")
                            job.Delete();
                    }
                    parentWeb = properties.Feature.Parent as SPWeb;
                    taskJob = new UpdateEmpReferralListTimer("xyz", parentWeb.Site.WebApplication);
                    schedule = new SPMinuteSchedule();
                    schedule.BeginSecond = 0;
                    schedule.EndSecond = 59;
                    taskJob.Schedule = schedule;
                    taskJob.Update();

                });
            }
            catch (Exception Ex)
            {
                string str = Ex.Message.ToString();
            }
        }