protected THub CreateHub <THub>()
     where THub : Hub
 {
     return(CreateHubHelperExtensions.CreateHub <THub, TMulti>(this));
 }
 protected THub CreateHub <THub, TClient>()
     where THub : Hub <TClient>
     where TClient : class
 {
     return(CreateHubHelperExtensions.CreateHub <THub, TClient, TMulti>(this));
 }