SqlCeConnection in CE 4.0: best practices for desktop use?

I am using SQL Server CE 4.0 in a WinForms desktop application and was wondering what are the recommended practices for using SqlCeConnection in this context. I noticed some older threads on the topic however some of them talk mostly about mobile or are
from a long time ago
1. Should a new SqlCeConnection be created every time the DB is accessed or is it better to have on SqlCeConnection open and shared through the entire application? My application can make frequent writes to the DB and when this happens I notice a noticeable
UI lag if a new SqlCeConnection is created for which DB access.
2. Can SqlCeConnection instances be shared across threads? On occasion my application performs DB reads in a background thread. Can I use the same SqlCeConnection instance from different threads?
3. Are there any additional steps needed to ensure multi-thread safety when multiple threads can access the DB simultaneously when SQL Server CE is deployed in embedded mode? When I create a new SqlCeConnection for each DB access I ran into a few crashes
and Monitor exceptions, possibly when multiple threads are accessing the same database.
I am using SQL Server CE 4.0 embedded in a WinForms 2.0 Windows desktop application (non-mobile). Any advice would be appreciated.

You must use seperate SqlCeConnection etc object per thread, as these objects are not thread safe.
I recommend opening the database on the main thread, and keep this connection unused and open for the lifetime of the app to keep the database file and engine "warm".
Please mark as answer, if this was it. Visit my SQL Server Compact blog http://erikej.blogspot.com

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