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Home/ Questions/Q 6087661
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Editorial Team
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Editorial Team
Asked: May 23, 20262026-05-23T11:53:45+00:00 2026-05-23T11:53:45+00:00

I think this is a pretty simple task, but I can’t for the life

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I think this is a pretty simple task, but I can’t for the life of me get it working.

Environment – MVC3, FluentValidation, StructureMap.

I have a ViewModel (RegisterViewModel) that has the following attributes { Email, IsBusiness, BusinessContact }. Email is required always, BusinessContact is required if the IsBusiness checkbox is checked.

I was trying to perform the BusinessContact required check client side, but can’t for the life of me figure out the right way to do this.

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  1. Editorial Team
    Editorial Team
    2026-05-23T11:53:45+00:00Added an answer on May 23, 2026 at 11:53 am

    You will have to roll your own client side validation to enforce the constraint your looking for. Phil Haack has a great post on how to do this http://haacked.com/archive/2009/11/19/aspnetmvc2-custom-validation.aspx

    Otherwise you could just enforce the constraint server side and add an error to the ModalState and reload the view.

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