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Editorial Team
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Asked: 2026-05-28T11:16:42+00:00

Assume we have an ASP.NET MVC3 Web site that makes use of Entity Framework

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Assume we have an ASP.NET MVC3 Web site that makes use of Entity Framework Code First approach to working with database.

The system is now working in test environment.

If the part of the DbContext is the following:

public DbSet<Incident> Incidents { get; set; }

will it cause DB-Code collaboration problems, if I, for example, add Properties to an Incident class?

Or will the framework just update the Database tables automatically, and will treat the older records, that were created without new properties as if they are null?

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1 Answer

  1. Editorial Team

    It depand on your database initialization setting.
    (CreateDatabaseIfNotExists, DropCreateDatabaseWhenModelChanges, DropCreateDatabaseAlways)

    eg: Database.SetInitializer(new CreateDatabaseIfNotExists())

    • If you didn’t set any database initialization, EF will use default
      initlizer “CreateDatabaseIfNotExists” and it would throw
      InvalidOperationError.

    • If you set as “DropCreateDatabaseWhenModelChanges“, EF will recreate
      the Database based on your new Model. But you will also need necessary
      access right to create the database and it is dangerous if you are in
      production environment.

    • If you set as “DropCreateDatabaseAlways“, EF will recreate the Database whenever
      you run the application.

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