New Post: how to validate enum values

public enum MyEnum {
   First, Second, Third
}

public class Foo {
  public MyEnum SomeProperty { get; set; }
}

public class FooValidator : AbstractValidator<Foo> {
  public FooValidator() {
    RuleFor(x => x.SomeProperty).Must(x => x == MyEnum.First || x == myEnum.Second); 
  }
}