title: Add a foreign key column to Identity database using code first in ASP.NET MVC5
body: <p>I would like to extend my AspNetUsers table with a foreign key attribute, CustomerID.</p>
  
  <p>I managed to migrate the ASP.NET Identity Database with our own created database. So the Identity tables and the tables in our own created database, now share the exact same database. </p>
  
  <p>However, I would like to map a relation between AspNetUsers and Customer using code first. How can I do that?</p>