[ServiceContract(Namespace = "http://Microsoft.ServiceModel.Samples")]
[ServiceKnownType(typeof(PurchaseOrder))]
public interface IOrderProcessor
{
    [OperationContract(IsOneWay = true, Action = "*")]
    void SubmitPurchaseOrder(MsmqMessage<PurchaseOrder> msg);
}

public class OrderProcessorService : IOrderProcessor
{
    [OperationBehavior(TransactionScopeRequired = true, TransactionAutoComplete = true)]
    public void SubmitPurchaseOrder(MsmqMessage<PurchaseOrder> ordermsg)
    {
        PurchaseOrder po = (PurchaseOrder)ordermsg.Body;
        Random statusIndexer = new Random();
        po.Status = (OrderStates)statusIndexer.Next(3);
        Console.WriteLine("Processing {0} ", po);
    }

    // Host the service within this EXE console application.
public static void Main()
{
    // Get base address from appsettings in configuration.
    Uri baseAddress = new Uri(ConfigurationManager.AppSettings["baseAddress"]);

    // Create a ServiceHost for the CalculatorService type and provide the base address.
    using (ServiceHost serviceHost = new ServiceHost(typeof(IOrderProcessor), baseAddress))
    {
    // Open the ServiceHostBase to create listeners and start listening for messages.
        serviceHost.Open();

    // The service can now be accessed.
        Console.WriteLine("The service is ready.");
        Console.WriteLine("The service is running in the following account: {0}", WindowsIdentity.GetCurrent().Name);
        Console.WriteLine("Press <ENTER> to terminate service.");
        Console.WriteLine();
        Console.ReadLine();

    // Close the ServiceHostBase to shutdown the service.
        serviceHost.Close();
    }
}
}

MsmqIntegrationBinding binding = new MsmqIntegrationBinding();
EndpointAddress address = new EndpointAddress("msmq.formatname:DIRECT=OS:.\\private$\\Orders");
ChannelFactory<IOrderProcessor> channelFactory = new ChannelFactory<IOrderProcessor>(binding, address);
IOrderProcessor channel = channelFactory.CreateChannel();

PurchaseOrder po = new PurchaseOrder();
po.customerId = "somecustomer.com";
po.poNumber = Guid.NewGuid().ToString();

PurchaseOrderLineItem lineItem1 = new PurchaseOrderLineItem();
lineItem1.productId = "Blue Widget";
lineItem1.quantity = 54;
lineItem1.unitCost = 29.99F;

PurchaseOrderLineItem lineItem2 = new PurchaseOrderLineItem();
lineItem2.productId = "Red Widget";
lineItem2.quantity = 890;
lineItem2.unitCost = 45.89F;

po.orderLineItems = new PurchaseOrderLineItem[2];
po.orderLineItems[0] = lineItem1;
po.orderLineItems[1] = lineItem2;

MsmqMessage<PurchaseOrder> ordermsg = new MsmqMessage<PurchaseOrder>(po);
using (TransactionScope scope = new TransactionScope(TransactionScopeOption.Required))
{
    channel.SubmitPurchaseOrder(ordermsg);
    scope.Complete();
}
Console.WriteLine("Order has been submitted:{0}", po);