CvvAttribute

[AttributeUsage(AttributeTargets.Property, AllowMultiple = false)]
    public class CvvAttribute : DataTypeAttribute
    {
        public CvvAttribute()
            : base("cvv")
        {
        }

        public override string FormatErrorMessage(string name)
        {
            if (ErrorMessage == null && ErrorMessageResourceName == null)
            {
                ErrorMessage = "CVV is not valid";
            }
            return base.FormatErrorMessage(name);
        }

        public override bool IsValid(object value)
        {
            if (value == null)
            {
                return true;
            }
            var regex = new Regex(@"^(?!000)\d{3,4}$", RegexOptions.Compiled | RegexOptions.IgnoreCase);
            var asString = value.ToString();
            var match = regex.Match(asString).Length > 0;
            return match;
        }
    }