SignalR - Cannot get username

Building chat application using SignalR, I'm new with SignalR, started with Tutorial: Getting Started with SignalR 2 and MVC 5

Everything passed fine, now I want impliment Application User Name as sender, when I use method like this:

$('#displayname').val('@Context.User.Identity.Name');

Hub gets current loged in username and displays it on page, here is my Hub Code:

[HubName("chatHub")]
public class ChatHub : Hub
{
    public void Send(string name, string message)
    {
        Clients.All.addNewMessageToPage(name, message);
    }

}

Now I want impliment username with another method, this method is described Here

Code below not working, can anyone explain why, I want to understant to know method how to use SingalR. Here is code that not works:

[HubName("chatHub")]
public class ChatHub : Hub
{
    public void Send(string name, string message)
    {
        name = Context.User.Identity.Name;
        Clients.All.addNewMessageToPage(name, message);
    }

}

Lot of thanks and sorry for my English.