entity framework - Problems with EF version after move project -


after move project vs2010 ef 4 vs 2012 ef5 , appear on project problems dataannotations on models 

[foreignkey("striddocumento")]  can't find type or space name 'foreignkey' [lost using directive or assembly reference]

i remove reference ef 4, add ef5 using nugget. problem persists

note: project mvc c# , asp.

likely missing using statement.

using system.componentmodel.dataannotations.schema;

you may want using fluent api instead of data annotations, thought.


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