Moving ASP.NET Identity model to class library

To move the IdentityModel into a class library (which is the right thing to do according to the SRP), follow these steps:

1. Create a class library. (ClassLibrary1)
2. Using NuGet, add a reference to Microsoft.AspNet.Identity.EntityFramework. This will also auto-add some other references.
3. Add a reference in your website to ClassLibrary1
4. Find WebSite/Models/IdentityModel.cs and move it to ClassLibrary1.
5. Make IdentityModel.cs look like this:
   

   public class ApplicationUser : IdentityUser
   {
   }
   
   public class ApplicationDbContext : IdentityDbContext<ApplicationUser>
   {
       public ApplicationDbContext()
           : base("YourContextName")
       {
       }
   }

6. Make sure your website's Web.config has YourContextName pointing to the right database in the section. (Note: this database can and should house your application data).
   

   <add name="YourContextName" connectionString="YourConnectionStringGoesHere"
     providerName="System.Data.SqlClient" />

7. Make your EF Context class inherit from your ApplicationDbContext:
   

   public class YourContextName : ApplicationDbContext
   {
       public DbSet<ABizClass1> BizClass1 { get; set; }
       public DbSet<ABizClass2> BizClass2 { get; set; }
       // And so forth ...
   }

When anyone in your site tries to log in or register, the Identity system will route them to your database with all your data which includes the Identity tables.
Good to go!