DelegateSerializationHolder is not permitted to be deserialized at this security level

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C#

I'm not sure how much code you need to see to handle this problem.
I am trying to add the ability for any logged-on client to send a message to all other logged-on clients.
My server code looks like this:

public OedipusServer<br />{<br />   // Register our tcp channel<br />   bool ensureSecurity = true;<br />   RemotingConfiguration.Configure("oedipus.exe.config", ensureSecurity);<br />   <br />   UserList insUserList = UserList.Instance;<br />   ObjRef refUserList = RemotingServices.Marshal(insUserList, "UserList");<br />   ...  //  More classes instanced here<br />   ServerClass insServerClass = ServerClass.Instance;<br />   ObjRef refAServerClass = RemotingServices.Marshal(insServerClass, "Messaging");<br />}<br />public class ServerClass : AbstractServer<br />{<br />   private static ServerClass mInstance = null;<br />   public static ServerClass Instance<br />   {<br />      get<br />      {<br />         if (mInstance == null)<br />            mInstance = new ServerClass();<br />         return mInstance;<br />      }<br />   }<br />   public override Object InitializeLifetimeService()<br />   {<br />      return null;<br />   }<br />   public override void myStatusHasChanged(int userID, int newStatus)<br />   {<br />      FireNewBroadcastedMessageEvent(userID, newStatus);<br />   }<br />   public event StatusChangedEventHandler myStatusChangedHandler;<br />   public override event StatusChangedEventHandler myStatusChangedEvent<br />   {<br />     add<br />     {<br />        myStatusChangedHandler = value;<br />     }<br />     remove<br />     {<br />     }<br />   }<br />   protected void FireNewBroadcastedMessageEvent(int userID, int newStatus)<br />   {<br />      myStatusChangedHandler(userID, newStatus);<br />   }<br />}<br />

I have another project, Messaging, which looks like this:

public delegate void StatusChangedEventHandler(int userID, int newStatus);<br />public abstract class AbstractServer : MarshalByRefObject<br />{<br />   public abstract void myStatusHasChanged(int userID, int newStatus);<br />   public abstract event StatusChangedEventHandler myStatusChangedEvent;<br />}<br />public abstract class AbstractBroadcastedMessageEventSink : MarshalByRefObject<br />{<br />   public void callbackStatusChanged(int userID, int newStatus)<br />   {<br />      internalCallbackStatusChanged(userID, newStatus);<br />   }<br />   protected abstract void internalCallbackStatusChanged(int userID, int newStatus);<br />}<br />

On the client side I have:

class EventSink : AbstractBroadcastedMessageEventSink<br />{<br />   protected override void internalCallbackStatusChanged(int userID, int newStatus)<br />   {<br />      //  Handle event here<br />   }<br />}<br />private AbstractServer rmMessaging;<br />public Office()<br />{<br />   rmMessaging = (AbstractServer)Activator.GetObject<br />                 (typeof(AbstractServer),<br />                 System.Configuration.ConfigurationManager.AppSettings<br />                 ["AbstractServerUrl"]);<br />   EventSink sinkStatusChanged = new EventSink();<br />   //  Subscribe to event<br />   rmMessaging.myStatusChangedEvent += <br />         new StatusChangedEventHandler(sinkStatusChanged.callbackStatusChanged);<br />}<br />private void button1_Click(object sender, EventArgs e)<br />{<br />   // Initiate the event<br />   rmMessaging.myStatusHasChanged(23, 14);<br />}<br /><br />

It's subscribing to the event which raises the runtime error "DelegateSerializationHolder is not permitted to be deserialized at this security level".