Sequence contains no matching element - EntityFramework

Question

I\'m using EF 6.1.0 and was creating a WCF Service.

First I created a Class Library containing my entities, Mappers and Context for initializing EF. I\'ve also creat

Answer 1

I got caught with this one because I referenced the reference property instead of the Id property.

        var t = modelBuilder.Entity();
        t.HasIndex(b => b.DocTypeId);