asp.net - SignalR User NullReferenceException -

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i've got code

using microsoft.aspnet.signalr;  namespace chat22 {     public class chathub : hub     {         public void send(string message)         {             string name = context.user.identity.name;             // call broadcastmessage method update clients.             clients.all.broadcastmessage(name, message);         }     } }

but when try send message, nullreferenceexception context.user.identity.name

but works fine when set username in js code, , add name parameter in function, getting context name doesn't work.

i tried on both local , published on web

how can names?

thanks

answer add authorization
http://www.asp.net/signalr/overview/security/hub-authorization#requireauth


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