c# - Send message to specific user -

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i'm trying send user connects welcome message, won't work:

    public void connected(string name)     {         clients.this.newmessage("hello world!"); //welcome message current user          clients.all.userconnected(name); //joined message     }

i know it's not lot of information give you, don't know need. (my front end angularjs, might useful)

you can 

 public override task onconnected()     {         string name = context.user.identity.name;          groups.add(context.connectionid, name);          clients.group(name).newmessage("hello world!"); //welcome message current user          return base.onconnected();     }

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