Start, Stop and Disable the job in SQL Server 2008

1) Use below procedure to start the Job in SQL

Exec msdb.dbo.sp_start_job @job_name = N'Job_Name'

Example:
Exec msdb.dbo.sp_start_job @job_name = N'Job_Name'

OR

Exec msdb.dbo.sp_start_job  N'Job name'

2) Use below procedure to stop the Job in SQL

Exec msdb.dbo.sp_stop_job @job_name = 'Job_Name'

Example:
Exec msdb.dbo.sp_stop_job @job_name = N'Job_Name'

OR

Exec msdb.dbo.sp_stop_job  N'Job name'

3) Use below procedure to enable or disable the Job in SQL

To enable the Job:

EXEC msdb.dbo.sp_update_job @job_name = N'Job_Name', @enabled = 1

To disable the Job:

EXEC msdb.dbo.sp_update_job @job_name = N'Job_Name', @enabled = 0