using System.ComponentModel.DataAnnotations;

​

public class Program

{

    public enum Categories

    {

        None = 0,

        Furniture = 1,

        Electronics = 2

    }

​

    public class CartItem

    {

        [EnumDataType(typeof(Categories))]

        public Categories Category

        {

            get;

            set;

        }

    }

​

    public static void Main()

    {

        var item = new CartItem()

        {Category = (Categories)(-1)};

        Validator.ValidateObject(item, new ValidationContext(item, null, null), true);

    }

}