The UserControlService method attempts to send a user-defined control code to a service. It returns one of the following ...

The UserControlService method attempts to send a user-defined control code to a service. It returns one of the following integer values:
0 - The request was accepted.
1 - The request is not supported.
2 - The user did not have the necessary access.
3 - The service cannot be stopped because other services that are running are dependent on it.
4 - The requested control code is not valid, or it is unacceptable to the service.
5 - The requested control code cannot be sent to the service because the state of the service (Win32_BaseService:State) is equal to 0, 1, or 2.
6 - The service has not been started.
7 - The service did not respond to the start request in a timely fashion.
8 - Unknown failure when starting the service.
9 - The directory path to the service executable was not found.
10 - The service is already running.
11 - The database to add a new service is locked.
12 - A dependency for which this service relies on has been removed from the system.
13 - The service failed to find the service needed from a dependent service.
14 - The service has been disabled from the system.
15 - The service does not have the correct authentication to run on the system.
16 - This service is being removed from the system.
17 - There is no execution thread for the service.
18 - There are circular dependencies when starting the service.
19 - There is a service running under the same name.
20 - There are invalid characters in the name of the service.
21 - Invalid parameters have been passed to the service.
22 - The account, which this service is to run under is either invalid or lacks the permissions to run the service.
23 - The service exists in the database of services available from the system.
24 - The service is currently paused in the system.
Other - For integer values other than those listed above, refer to Win32 error code documentation.