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Editorial Team
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Asked: 2026-05-25T21:32:42+00:00

This question states that if Entity Framework and code first is used, some default

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This question states that if Entity Framework and code first is used, some default validation is performed. I am using Entity Framework database-first and would like to use MVC 3 unobtrusive javascript validation. Is there some default validation that will be performed, such as client-side checking for numbers when the database column is INTEGER, or client-side checking of string length against VARCHAR column lengths?

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  1. Editorial Team

    There should be no client side check unless you add the jQuery.

    There are some default checking: DateTime field is always required. I don’t have a complete list though.

    For code first, you have detailed data annotation already in place, which specifies each field in the database. This annotation will enable a lot of default validation.

    However, if it is database first, all you get from the EF is a group of partial classes (corresponding to the tables) with no annotation. The data annotation is usually added in a separate metadata file. Without this extra annotation, no default validation is there. EF simply hands the task of annotation to the programmer.

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