I have a column like this in 1 of my database tables
DateCreated, datetime, default(GetDate()), not null
I am trying to use the Entity Framewor
You have to manually edit the edmx xml and set your SSDL StoreGeneratedPattern attributes to identity or computed. But whenever you update your edmx via the designer your changes will get overwritten.
This is a known issue. Please see the following links for more details:
Microsoft Connect Ticket
Using a GUID as an EntityKey in Entity Framework 4