var n;

            if (x == userIds.length - 1) {
                n = parseInt(Math.random() * userIds.length);

                if (userIds[n] != id) {
                    $('#btnSendMsg').click(function () {

                        var msg = $("#txtMessage").val();
                        if (msg.length > 0) {
                            chatHub.server.send(userIds[n],id, msg);
                            alert(userIds[n] + "         " + id);
                            $("#txtMessage").val('');
                        }
                    });
                    $("#txtMessage").keypress(function (e) {
                        if (e.which == 13) {
                            $('#btnSendMsg').click();
                        }
                    });
                }
            }

public class OneHub :Hub
{
    static List<UserId> ConnectedUser = new List<UserId>();
    static List<MessageDetail> CurrentMessage = new List<MessageDetail>();


    public void Send(string toUserId, string message)
    {

        string fromUserId = Context.ConnectionId;

        var toUser = ConnectedUser.FirstOrDefault(x => x.ConnectionId == toUserId);
        var fromUser = ConnectedUser.FirstOrDefault(x => x.ConnectionId == fromUserId);

        if (toUser != null && fromUser != null)
        {
            // send to
            Clients.Client(toUserId).sendPrivateMessage(fromUserId, message);

            // send to caller user
            Clients.Caller.send(toUserId, message);
        }



    }


    public void Connect(string id)
    {



        if (ConnectedUser.Count(x => x.ConnectionId == id) == 0)
            {
            ConnectedUser.Add(new UserId { ConnectionId = id });

            // send to caller
            Clients.Caller.onConnected(id,ConnectedUser,CurrentMessage);

            // send to all except caller client
            Clients.AllExcept(id).onNewUserConnected(id);
        }


    }