Association end is not mapped in ADO entity framework

Question

I am just starting out with ADO.net Entity Framework I have mapped two tables together and receive the following error:

Error   1   Error 11010: Association End          


        

Answer 1

The Entity Framework designer is terrible - I've had the same problem many times (and your problem too, Craig):

This happens when you have a many-to-one association which is improperly setup. They could very easily fix the designer to make this process simple; but instead, we have to put up with this crap.

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To fix:

• Click on the association, and go to the mapping details view.
• Under association, click on Maps to . Choose the table(s) which make up the many side of the relationship (ie. the table(s) which make up the *-side of the association in the designer)
• Under Column, choose the table-columns which map to each entity-side Property. You get this error when one of those entries are blank.