Custom Timer Jobs not visible in Central Admin Job Definitions

Question

I have multiple custom timer jobs which I was using on old farm, and it was successfully working and was visible in the Central Admin Job Definitions.
But ever since I moved to new farm, by restoring the site collections from old to new farm, and deployed the custom timer jobs on new farm, they are not visible in Central Admin Job Definitions.
I tried to change the scope of the solution to "Web Application", and deployed it's wsp in new farm, then also they are not visible in Job Definitions. But I can see them in "Farm Solutions", they have been successfully deployed.
Please suggest what should I do.

Answer 1

public override void FeatureActivated(SPFeatureReceiverProperties properties)
SPWeb wb = properties.Feature.Parent as SPWeb;
if (wb == null)
throw new SPException("Error obtaining reference to context Site ");
// make sure the job isn't already registered
foreach (SPJobDefinition job in wb.Site.WebApplication.JobDefinitions)
if (job.Name == List_JOB_NAME)
job.Delete();
RSS listLoggerJob = new RSS(List_JOB_NAME, wb.Site.WebApplication);
SPHourlySchedule schedule = new SPHourlySchedule();
schedule.BeginMinute = 0;
schedule.EndMinute = 59;
listLoggerJob.Schedule = schedule;
listLoggerJob.Update();
public override void FeatureDeactivating(SPFeatureReceiverProperties properties)
SPWeb wb = properties.Feature.Parent as SPWeb;
// delete the job
foreach (SPJobDefinition job in wb.Site.WebApplication.JobDefinitions)
if (job.Name == List_JOB_NAME)
job.Delete();