Invalid object name ‘dbo.AspNetUsers’ in Asp.NET MVC 5 Entity Framework

If you have an existing database, and you want to include ASP.NET Identity tables to it, you can face this error. You may not know how to integrate [AspNetRoles], [AspNetUserClaims], [AspNetUsers], [AspNetUserLogins] tables into your existing database when you start. Although there are a lot of resources about this topic, this answer tries to be short and to the point. You may want to use the Database-First approach in Entity Framework together with the ASP.NET Identity feature of ASP.NET MVC. This is a very short tutorial for dummies. I am sorry if my English is poor.