using System;

 using System.Collections.Generic;

 using System.Linq;

 using System.Text;

 using System.Threading.Tasks;

 using System.ServiceModel;

 using System.Collections;

 namespace SharpDisplayInterface

 {

     [ServiceContract(   CallbackContract = typeof(IDisplayServiceCallback),

                         SessionMode = SessionMode.Required)]

     public interface IDisplayService

     {

         [OperationContract(IsOneWay = true)]

         void Connect(string aClientName);

         [OperationContract(IsOneWay = true)]

         void Disconnect(string aClientName);

         [OperationContract(IsOneWay = true)]

         void SetText(int aLineIndex, string aText);

         [OperationContract(IsOneWay = true)]

         void SetTexts(System.Collections.Generic.IList<string> aTexts);

     }

     public interface IDisplayServiceCallback

     {

         [OperationContract(IsOneWay = true)]

         void OnConnected();

         [OperationContract(IsOneWay = true)]

         void OnServerClosing();

     }

 }