Making the transition from ASP.Net to windows forms.
While I would never do this in ASP.Net, it seems that it may not be a bad idea in windows forms: I have a pretty straightforward little application where I have a main form that remains open as long as the application is running. Various other forms are opened from this main form and interact in various ways with an Access database. Is it a good idea (performance, style, etc.) to open a connection to the database on this form and pass a reference to it to each of the forms the user may open Then close it when the app exits. Is this a bad design What are the pros and cons of the approach
Thanks

Keeping connection open: Good Idea?
JOSE3007
If you're just looking to keep things simple by not having your ancillary forms have to manage connections, you could keep a single connection object in your main form and open and close on request from the other forms.
If it's a small app with only one user at a time and the db is on the same machine as your app, the best practices police probably won't come looking for you if you keep the connection alive for the duration of the app :)
JGIS
If your application uses multi-threading, make sure you only execute one command on the connection at any time. Whidbey will introduce MARS (Multiple Active Results Sets), that enables executing several commands over the same connection at the same time. (Not sure if that only works on SQL Server...)