asp.net - Error: SignalRRouteExtension.Mapconnection is obsolete. use MapSignalR in Owin Startup class -

i developing asp.net mvc application asp.net signalr. getting error , couldn't find how solve this. global.asax class , getting error @ here when started project:

 public class mvcapplication : system.web.httpapplication {     protected void application_start(object sender, eventargs e)     {         arearegistration.registerallareas();          webapiconfig.register(globalconfiguration.configuration);         filterconfig.registerglobalfilters(globalfilters.filters);         routeconfig.registerroutes(routetable.routes);          //this added , getting error.         routetable.routes.mapconnection<nfcconnection>("echo", "/echo");     } } 

and connection class @ bottom

public class nfcconnection : persistentconnection {     protected override task onconnected(irequest request, string connectionid)     {         string msg = string.format(             "a new user {0} has joined. (id: {1})",             request.querystring["name"], connectionid);         return connection.broadcast(msg);     }      protected override task onreceived(irequest request, string connectionid, string data)     {          string msg = string.format(             "{0}: {1}", request.querystring["name"], data);         return connection.broadcast(msg);     } } 

this part broadcast data coming client. , startup class owin that;

 public class startup {     public void configuration(iappbuilder app)     {         app.mapsignalr();     }  } 

when start project line

routetable.routes.mapconnection<nfcconnection>("echo", "/echo"); 

giving me error;

error'system.web.routing.signalrrouteextensions.mapconnection<t>(system.web.routing.routecollection, string, string)' obsolete: 'use iappbuilder.mapsignalr<tconnection> in owin startup class. 

how can solve this?

remove:

routetable.routes.mapconnection<nfcconnection>("echo", "/echo"); 

and change:

app.mapsignalr(); 

to:

app.mapsignalr<nfcconnection>("/echo");