enum example

OrderResult.cs

namespace QuoteFeed.OMS.Data
{
    public abstract class OrderResult
    {
        public abstract string ResultString();

        public static readonly OrderResult Success = new SuccessResult();
        public static readonly OrderResult DuplicateId = new DupliceIdResult();
        public static readonly OrderResult InvalidRoute = new InvalidRouteResult();
        public static readonly OrderResult InvalidOrderType = new InvalidOrderTypeResult();
        public static readonly OrderResult RouteNotConnected = new RouteNotConnectedResult();
        public static readonly OrderResult InvalidDataInOrder = new InvalidDataInOrderResult();
        public static readonly OrderResult InvalidSecurity = new InvalidSecurityResult();

        private class SuccessResult : OrderResult
        {
            public override string ResultString() { return "Success"; }
        }

        private class DupliceIdResult : OrderResult
        {
            public override string ResultString() { return "Order with same LocalId already exists"; }
        }

        private class InvalidRouteResult : OrderResult
        {
            public override string ResultString() { return "Invalid Route"; }
        }

        private class RouteNotConnectedResult : OrderResult
        {
            public override string ResultString() { return "Route not connected"; }
        }

        private class InvalidOrderTypeResult : OrderResult
        {
            public override string ResultString() { return "Invalid order type for route"; }
        }

        private class InvalidDataInOrderResult : OrderResult
        {
            public override string ResultString() { return "Invalid data in order"; }
        }

        private class InvalidSecurityResult : OrderResult
        {
            public override string ResultString() { return "Invalid security"; }
        }
    }
}

//using example

//OrderResult result = SendNewOrder(new TestOrder());
//if (result != OrderResult.Success) return; //failed