title: You custom database IdentityDbContext
body: <p>I was trying to develop an application and created my own database which then was reflected to an entity model using database first. So I now already have let's say myOwnDBContext. 
  Then I thaught it wuld be a nice idea to mix it with the classes generated by IdentityDbContext. But when i just changed the connection string in IdentityModel like this</p>
  
  <pre><code> public class ApplicationDbContext : IdentityDbContext&lt;ApplicationUser&gt;
      {
          public ApplicationDbContext()
              : base("myOwnDBConnectionString")
          {
          }
      }
  </code></pre>
  
  <p>The tables were not generated as I would expect in myOwnDB but instead I received the following error.</p>
  
  <blockquote>
    <p>The entity type ApplicationUser is not part of the model for the
    current context.</p>
  </blockquote>
  
  <p>Is there a way I can mix the defualt database of IdentityDbContext with my own databse?</p>