public void TestRetrieveGuestsSearchedBothNames()
        {
            //Arrange
            List <Guest> guests = null;
            string       lname  = _guests[0].LastName;
            string       fname  = _guests[0].FirstName;

            //Act
            guests = _guestManager.RetrieveGuestsSearched(lname, fname);
            //Assert
            Assert.IsNotNull(guests);
        }