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Difference between “Independent association” and “Foreign key association” in Entity Framework

I begin to understand the difference between “Independent association” and “Foreign key association” in Entity Framework Code First thanks to this article : http://www.ladislavmrnka.com/2011/05/foreign-key-vs-independent-associations-in-ef-4/

Advice: use both (Independent associations and Foreign key associations):

“This saves on unnecessary DB lookups, allows lazy loaking, and allows you to easily see/set the ID if you know what you want it to be. Note that having both does not change your table structure in any way.”

Source: http://stackoverflow.com/questions/5281974/code-first-independent-associations-vs-foreign-key-associations

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