Why MVC Model Binder set required for int, long values?

I have a Model Like this

public int Id {get;set;}

[Required]
public string FirstName{get; set}
[Required]
public string LastName{get; set}

The Id is auto generate in DB. when I want call Create action The ModelState says that "The Id field is required"!!!! I Found this for my problem but it not clean solution. Is there an other way to solve this?

Is there a way that I change Mvc ModelBinder behavior for value types?

You can also set the property type to Nullable<T>, and then just manually enforce any required validation you might need to do before working with the database.

<!-- language: lang-cs -->

public int? Id {get;set;}

Further Reading:

• Unrequired property keeps getting data-val-required attribute
• ASP.NET MVC optional field being treated as required
• "The Id field is required" validation message on Create