Why must assemblies referenced in providers.config have Copy Local set to True for Reference in Visual Studio, even when they are GAC'd?

[Todd Langdon <to...@pinnsg.com>]

Hello,
This took me FOREVER to figure out!  IBatis.Net was complaining when it
tried to load the config that it could not load the assemblies (System.Data
for SQL Server) and I just happened to try changing the Copy Local on the
reference in Visual Studio to True.  System.Data is in the GAC - why does
there need to be a copy in the output folder for this to work?
Thanks,
Todd