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Editorial Team
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Asked: 2026-06-06T17:40:19+00:00

I am new in MVC3 i am going to create a MVC3 test project

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I am new in MVC3 i am going to create a MVC3 test project where i am create model class name WhiteAccount with ID,Name,Email,Password property. and successfully create a DB but when i add another new property in that WhiteAccount model class and in my DB table too but it give me some error. Some people say just delete the EDMmetadata table from your DB, But Here is the problem i have no EDMmetadata table in my DB ! I create my DB by EntityFramework v4.3.1 system automatically (CodeFirst). What should i do now ?

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  1. Editorial Team

    Check for the __MigrationHistory table.
    Open the nuget package manager console and run

    update-database -script

    It will likely give you a message about having to enable it first, follow those directions
    Run: Enable-Migrations

    some more info on migrations
    http://blogs.msdn.com/b/adonet/archive/2012/02/09/ef-4-3-code-based-migrations-walkthrough.aspx

    Im gathering this table is there in your db (under system tables) and it contains your model information. Since your project changed you need to tell the migrations about the new field or delete the table (__MigrationsHistory)

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