Notification In C# App Of SSIS Package Completion

Hi,

I'm working on an application that involves various components two of which are an SSIS package and a C# windows service.

The SSIS package imports data from a number of structured flat files into database tables and then runs a number of stored procedures that rearrange/normalize the data and perform certain calculations the results of which are also stored in the database. The package will run at regular intervals as new data structured flat files become available.

The C# windows service is a caching server and the data it needs to cache is the results of the stored procedures run by the SSIS package. I'm therefore looking for a way to notify the C# app when the SSIS package has completed.

I've looked at Sql Servers Query Notification but, if i've understood correctly, that seems to depend on the client code issuing a SQL statement and attaching a sqldependency object that will check for changes to the resultset of the particular query which is not really what i'm after.

I've considered SSIS events but again i think for a C# app to monitor SSIS events the package needs to have been executed from within the C# app. If there's a way for the SSIS package, running completely independently of the C# process, to fire an event that the C# windows service can subscribe to then that would be ideal.

I don't know whether other options like Sql Server Notification Services or even something quite crude like writing a flag to a flat file that the C# service can read would be more ideal?

Thanks

M.