1.1 --- a/Interface/Interface.cs	Thu Aug 14 18:37:23 2014 +0200
     1.2 +++ b/Interface/Interface.cs	Fri Aug 15 10:20:01 2014 +0200
     1.3 @@ -9,8 +9,9 @@
     1.4  
     1.5  namespace SharpDisplayInterface
     1.6  {
     1.7 -
     1.8 -    [ServiceContract(CallbackContract = typeof(IDisplayServiceCallback))]
     1.9 +    
    1.10 +    [ServiceContract(   CallbackContract = typeof(IDisplayServiceCallback),
    1.11 +                        SessionMode = SessionMode.Required)]
    1.12      public interface IDisplayService
    1.13      {
    1.14          [OperationContract(IsOneWay = true)]