case "Boolean":
                case "DateTime":
                case "Integer":
                case "Money":
                case "String": - не надо реализовано ниже

                Equals: return x.CompareTo(y) == 0;
                NotEquals: return x.CompareTo(y) != 0;
                GreaterThan: return x.CompareTo(y) > 0;
                LessThan: return x.CompareTo(y) < 0;
                GreaterThanOrEquals: return x.CompareTo(y) >= 0;
                LessThanOrEquals: return x.CompareTo(y) <= 0;
                IsNull: return null == x && null == y;
                IsNotNull: return null != x && null != y;
                Between: return x1.CompareTo(y) >= 0 && x2.CompareTo(y) <= 0;
                NotBetween: return x1.CompareTo(y) < 0 && x2.CompareTo(y) > 0;
                Contains: return x.IndexOf(y) >-1;
                NotContains: return x.IndexOf(y) == -1;
                StartsWith: return x.IndexOf(y) == 0;
                EndsWith:return x.LastIndexOf(y) == y.Length - x.Length; 
                IsEmpty: return String.IsNullOrWhiteSpace(x) && String.IsNullOrWhiteSpace(x);
                IsNotEmpty: return !String.IsNullOrWhiteSpace(x) && !String.IsNullOrWhiteSpace(x);