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Asked: 2026-05-14T17:11:08+00:00

I am just starting out with ADO.net Entity Framework I have mapped two tables

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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 'OperatorAccess' is not mapped.    E:\Visual Studio\projects\Brandi II\Brandi II\Hospitals.edmx    390 11  Brandi II

Not sure what it is I am doing wrong.

I believe I can add some more clarity to the issue (learning as I go):

When I look at the Mapping details and look at the association, the column for operatoraccess table (from above) is blank and the drop down only includes field from the linked table.

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  1. Editorial Team

    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.

    To fix:

    • Click on the association, and go to the mapping details view.
    • Under association, click on Maps to <tablename>. 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.
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