C#

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public class Player
{
    public string ID { get; set; }
    public string StartTime { get; set; }
    public string EndTime { get; set; }

    public Player()
    {
       ID = Guid.NewGuid().ToString();
       StartTime = DateTime.Now.ToString();
    }
}

[DataContract]
public class ChessGame
{   [DataMember]
    public List<Player> Players { get; set; }
    [DataMember]
    public string PlayerId { get; set; }

    public Facility()
    {
        Players = new List<Player>();
        PlayerId = string.Empty;
    }

    public void StartGame()
    {
        Player p = new Player();
        PlayerId = p.ID;
        Players.Add(p);
    }
}

public class GameService:IGameService
{
   ChessGame cg = new ChessGame();
    public void StartGame()
   {
      cg.StartGame();
   }
   public string GetPlayerID()
   {
      return cg.PlayerId
   }
   public string GetStartTime(string id)
   {
      return cg.Players.Find(p => p.ID == id).StartTime;
   }
}

 [ServiceContract]
  public interface IGameService
   {
       [WebInvoke(UriTemplate = "Game/", Method = "POST", ResponseFormat = WebMessageFormat.Xml)]
       [OperationContract]
       void StartGame();

       [WebGet(UriTemplate = "ID/", BodyStyle = WebMessageBodyStyle.Bare, RequestFormat = WebMessageFormat.Xml)]
       [OperationContract]
       string GetPlayerID();

       [WebGet(UriTemplate = "Time/{id}", BodyStyle = WebMessageBodyStyle.Bare, RequestFormat = WebMessageFormat.Xml)]
       [OperationContract]
       string GetStartTime(string id);
    }

static void Main(string[] args)
{
  string ID = string.Empty;

  ChannelFactory<IGameService> channelFactory = new ChannelFactory<IGameService>(new WebHttpBinding(), "http://localhost:8080");
  channelFactory.Endpoint.Behaviors.Add(new WebHttpBehavior());

  IGameService channel = channelFactory.CreateChannel();

  channel.StartGame();
  ID = channe.GetPlayerID();
  Console.WriteLine("ID is: {0} ", ID);

  Console.WriteLine("Game started at: {0} ", channe.GetStartTime(ID));

  Console.Read();
}