entity framework - How I Keep My Database Content -

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I am creating an ASP.NET MVC project with the first model of the unit framework code. Suppose that this project has been done. If I change the model code the next day, the first initializer will drop and create the database. This is a problem that pleases my thousands of records, how do I keep a database record? I can not keep the seed method with thousands of records

The keyword is "database migration", and their description example First for the code

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