C#/SP: Timer Job feature activation/deactivation

    [Guid("xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx")]
    public class TimerJobFeatureEventReceiver : SPFeatureReceiver
    {


        public override void FeatureActivated(SPFeatureReceiverProperties properties)
        {

            SPWebApplication webApplication = properties.Feature.Parent as SPWebApplication;
            if (webApplication != null)
            {
                DeleteJobAndSettings(properties);
                try
                {
                    CustomTimerJob job = new CustomTimerJob(webApplication);
                    SPMinuteSchedule schedule = new SPMinuteSchedule();
                    schedule.BeginSecond = 0;
                    schedule.EndSecond = 59;
                    schedule.Interval = 5;
                    job.Schedule = schedule;

                    job.Update();
                }
                catch (Exception ex)
                {
                    CustomLoggingSvcBase.Current.LogException(CustomLoggingSvcBase.DiagnosticCategory.TimerJob, ex);
                    throw new SPException(ex.Message, ex);
                }
            }
            else
            {
                string msg = "FeatureActivated - WebApplication is null";
                throw new SPException(msg);
            }

        }

        public override void FeatureDeactivating(SPFeatureReceiverProperties properties)
        {
            DeleteJobAndSettings(properties);
        }


        #region Utils

        private void DeleteJobAndSettings(SPFeatureReceiverProperties properties)
        {
            SPWebApplication webApplication = properties.Feature.Parent as SPWebApplication;
            if (webApplication != null)
            {
                foreach (SPJobDefinition job in webApplication.JobDefinitions)
                {
                    if (job.Name.Equals(CustomTimerJob.JobName))
                    {
                        job.Delete();
                        break;
                    }
                }
            }
            else
            {
                string msg = string.Format("{0}: DeleteJobAndSettings - WebApplication is null", this.GetType().Name);
                throw new SPException(msg);
            }

        }

        public static string GetFeatureGuid()
        {
            string ret = string.Empty;

            Type t = typeof(TimerJobFeatureEventReceiver);
            object[] attrs = t.GetCustomAttributes(typeof(GuidAttribute), false);
            if (attrs != null && attrs.Length == 1)
            {
                GuidAttribute attr = attrs[0] as GuidAttribute;
                if (attr != null)
                {
                    ret = attr.Value;
                }
            }
            return ret;
        }
        #endregion