How to make a complex type visible to the client in .NET remoting and WCF?

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C#

I'm currently testing several ways to have one application get hold of an object from another application. Both are written in C# and wether I use IPC channels or WCF Service Contracts I end up with the same problem. If I use a simple class whose properties and methods only return the built in types (such as int, string or ArrayList) it works fine, but if I add another property of a custom made type I get an error. IPC gives me a InvalidCastException and WCF puts the channel in a Faulted state and it breaks. Obviously I'm doing something wrong and I hope someone can give me a hand. The server looks like this:

public interface IBase {<br /><br />   int IntTest { get; }<br />   String StringTest { get; }<br />   IOther OtherTest { get; }<br /><br />   String Test(String txt);<br />   IOther Test3();<br />}<br /><br />public interface IOther {<br />   String StringTest { get; }<br />   String Test(String txt);<br />}<br /><br />public class Base : MarshalByRefObject, IBase {<br /><br />   public int IntTest {<br />     get { return 4; }<br />   }<br /><br />   public string StringTest {<br />     get { return "A string from Base"; }<br />   }<br /><br />   public IOther OtherTest {<br />     get { return new Other(); }<br />   }<br /><br />   public string Test(string txt) {<br />     return "Base called with: " + txt;<br />   }<br /><br />   public IOther Test3() {<br />     return new Other();<br />   }<br /><br />}<br /><br />public class Other : MarshalByRefObject, IOther {<br /><br />   public string StringTest {<br />     get { return "A string from Other"; }<br />   }<br /><br />   public string Test(string txt) {<br />     return "Other method called with: " + txt;<br />   }<br /><br />}

The server is registered like this:

public MainWindow() {<br />   InitializeComponent();<br />   IpcChannel ipcCh = new IpcChannel("IPChannelName");<br />   ChannelServices.RegisterChannel(ipcCh, false);<br />  RemotingConfiguration.RegisterWellKnownServiceType(typeof(Base), "CName", WellKnownObjectMode.Singleton);<br />}

The client looks something like this:

IpcChannel ipcCh = new IpcChannel("myClient");<br />ChannelServices.RegisterChannel(ipcCh, false);<br />obj = (IBase)Activator.GetObject(typeof(IBase), "ipc://IPChannelName/CName");<br />Console.WriteLine("Returns: " + obj.Test("a text"));<br />Console.WriteLine("Returns: " + obj.StringTest + " " + obj.StringTest.Length);<br />Console.WriteLine("Returns: " + obj.IntTest);<br />Console.WriteLine(obj.OtherTest.ToString());

The last line gives me the InvalidCastException or, in the cae of WCF, the Faulted pipe. Please help.