Public Class ClientContext
    Private Sub Test ()
        Try
'////   Me._Session.ObjectFactory.get_Mitarbeiter  kommt vom Host
'/////   sind alles MBR Objekte
 
            Dim myMab As Mitarbeiter = _
              Me._Session.ObjectFactory.get_Mitarbeiter.Items(0)
 
'/////  hier kommt die exeption:
            Me._Session.ObjectFactory.get_Mitarbeiter.Add(myMab)
 
        Catch ex As Exception
            Me.Log.Message(Me._Session, ex)
            MsgBox(ex.ToString)
        End Try
    End Sub

System.Runtime.Serialization.SerializationException: Auf den Typ _
  'System.Runtime.Remoting.ObjRef' kann aufgrund von Sicherheitseinschränkungen _
  nicht zugegriffen werden. ---> System.Security.SecurityException: Anfrage _
  fehlgeschlagen.
   at System.Security.SecurityRuntime.FrameDescSetHelper( _
   FrameSecurityDescriptor secDesc, PermissionSet demandSet, PermissionSet& _
   alteredDemandSet)
   at _
   System.Runtime.Serialization.FormatterServices.nativeGetSafeUninitializedObj_
   ect(RuntimeType type)
   at System.Runtime.Serialization.FormatterServices.GetSafeUninitializedObject( _
   Type type)
   --- Ende der internen Ausnahmestapelüberwachung ---
 
Server stack trace: 
   at System.Runtime.Serialization.FormatterServices.GetSafeUninitializedObject( _
     Type type)
   at System.Runtime.Serialization.Formatters.Binary.ObjectReader.ParseObject( _
   ParseRecord pr)
   at System.Runtime.Serialization.Formatters.Binary.ObjectReader.Parse( _
   ParseRecord pr)
   at _
   System.Runtime.Serialization.Formatters.Binary.__BinaryParser.ReadObjectWith_
   MapTyped(BinaryObjectWithMapTyped record)
   at _
   System.Runtime.Serialization.Formatters.Binary.__BinaryParser.ReadObjectWith_
   MapTyped(BinaryHeaderEnum binaryHeaderEnum)
   at System.Runtime.Serialization.Formatters.Binary.__BinaryParser.Run()
   at System.Runtime.Serialization.Formatters.Binary.ObjectReader.Deserialize( _
     HeaderHandler handler, __BinaryParser serParser, Boolean fCheck, _
     IMethodCallMessage methodCallMessage)
   at _
   System.Runtime.Serialization.Formatters.Binary.BinaryFormatter.Deserialize( _
   Stream serializationStream, HeaderHandler handler, Boolean fCheck, _
   IMethodCallMessage methodCallMessage)
   at _
   System.Runtime.Serialization.Formatters.Binary.BinaryFormatter.UnsafeDeseria_
   lize(Stream serializationStream, HeaderHandler handler)
   at _
   System.Runtime.Remoting.Channels.CoreChannel.DeserializeBinaryRequestMessage( _
   String objectUri, Stream inputStream, Boolean bStrictBinding, _
   TypeFilterLevel securityLevel)
   at System.Runtime.Remoting.Channels.BinaryServerFormatterSink.ProcessMessage( _
   IServerChannelSinkStack sinkStack, IMessage requestMsg, ITransportHeaders _
   requestHeaders, Stream requestStream, IMessage& responseMsg, _
   ITransportHeaders& responseHeaders, Stream& responseStream)
 
Exception rethrown at [0]: 
   at System.Runtime.Remoting.Proxies.RealProxy.HandleReturnMessage(IMessage _
     reqMsg, IMessage retMsg)
   at System.Runtime.Remoting.Proxies.RealProxy.PrivateInvoke(MessageData& _
   msgData, Int32 type)
   at ApsisPlus.BusinessTier.ListBase.Add(Object value)
   at ApsisPlus.frmTest.frmTest_Load(Object sender, EventArgs e) in _
     C:\Code\Micke\ApsisPlus\branches\ApsisPlus\Applikations\Test\frmTest.vb:li_
     ne 67

Micke