simple SignalR chat hub

ChatHub.cs

public class ChatHub : Hub
{
    public void Send(string message)
    {
        Clients.All.SendAsync("SendMessage", Context.User.Identity.Name, message);
    }

    public override async Task OnConnectedAsync(){
        await Clients.All.SendAsync("SendAction", Context.User.Identity.Name, "joined");
    }

    public override async Task  OnDisconnectedAsync(System.Exception exception){
        await Clients.All.SendAsync("SendAction", Context.User.Identity.Name, "left");
    }

}