Data annotations, why does boolean prop.IsRequired always equal true

Question

I have a model containing a boolean with no [Required] attribute

public bool IsOptedIn { get; set; }

I have overriden Ob

Answer 1

DataAnnotationsModelValidatorProvider.AddImplicitRequiredAttributeForValueTypes = false; 

Add this line to your Application_Start method from Global.asax. By default MVC adds [Required] attribute to non-nullable value types (because you can't convert a null into a bool, it must be a bool).