How to use SignalR hub instance outside of the hubpipleline

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You need to use GetHubContext:

var context = GlobalHost.ConnectionManager.GetHubContext<chatHub>();
context.Clients.All.Send("Admin", "stop the chat");

This is described in more detail at http://www.asp.net/signalr/overview/signalr-20/hubs-api/hubs-api-guide-server#callfromoutsidehub.

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