[SecurityPermission(SecurityAction.LinkDemand, Flags = SecurityPermissionFlag.Infrastructure)]
public void ProcessMessageStart(IMessage requestMessage, bool bClientSide, bool bAsyncCall) {
   
   Console.WriteLine("\nProcessMessageStart");
   Console.WriteLine("requestMessage = {0}", requestMessage);
   
   try {
      Console.WriteLine("SessionId = {0}.",
          RemotingServices.GetSessionIdForMethodMessage((IMethodMessage)requestMessage));
   }
   catch (InvalidCastException) {
      Console.WriteLine("The requestMessage is not an IMethodMessage.");
   }

   IMethodCallMessage requestMethodCallMessage;
   
   try {
      requestMethodCallMessage = (IMethodCallMessage)requestMessage;
      // Prints the details of the IMethodCallMessage to the console.
      Console.WriteLine("\nMethodCall details");
      Console.WriteLine("Uri = {0}", requestMethodCallMessage.Uri);
      Console.WriteLine("TypeName = {0}", requestMethodCallMessage.TypeName);
      Console.WriteLine("MethodName = {0}", requestMethodCallMessage.MethodName);
      Console.WriteLine("ArgCount = {0}", requestMethodCallMessage.ArgCount);
      
      Console.WriteLine("MethodCall.Args");
      foreach(object o in requestMethodCallMessage.Args)
          Console.WriteLine("\t{0}", o);
      
      // Sends this method call message to another server to replicate
      // the call at the second server.
      if (requestMethodCallMessage.Uri == replicatedServiceUri) {
         
         SampleService replicationService = 
            (SampleService)Activator.GetObject(typeof(SampleService), 
            replicationServerUrl + replicatedServiceUri);
         
         IMethodReturnMessage returnMessage = 
            RemotingServices.ExecuteMessage(replicationService, requestMethodCallMessage);
         
         // Prints the results of the method call stored in the IMethodReturnMessage.
         Console.WriteLine("\nMessage returned by ExecuteMessage.");
         Console.WriteLine("\tException = {0}", returnMessage.Exception);
         Console.WriteLine("\tReturnValue = {0}", returnMessage.ReturnValue);
         Console.WriteLine("\tOutArgCount = {0}", returnMessage.OutArgCount);
         Console.WriteLine("Return message OutArgs");
         
         foreach(object o in requestMethodCallMessage.Args)
            Console.WriteLine("\t{0}", o);
      }
   }
   catch (InvalidCastException) {
       Console.WriteLine("The requestMessage is not a MethodCall");
   }
}