If I have an SF C# app connected to SQL Server and there is process in a business object that interacts with other business objects and changes data :

In my SF UI the interaction of the BOs is done in a winform code. 

The connections are made in the startup of the app. 

How would I call this same BO process from outside of my SF app ( or automatically run my SF app to invoke that process with no UI ) and take advantage of connections and bo interaction etc ? 

The idea is that a backnend process is going to run an SSIS package to get CSV data into a staging table ( one of the bos in my app ) and then bo logic is going to create or update reocords in three other tables based on the new staging records. 

I may also want to pass into the app the id of the staging record batch to process.

Suggestions greatly appreciated.

Hi Charles.

The BOs should be in a library of itself, so you can reference this DLL in as many projects as you need.
The connection string can be shared by many EXEs. Just set the ConnectionManager.ApplicationKey to the same key and they will share the same connection originally set.