C#: GUI to display realtime messages from Windows Service

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What you can do is have the windows service have way of registering for an event (you can do this through using Windows Communication Foundation). When your error comes up, it fires that event, and your winforms app will be notified. It’s called a duplex contract:

http://social.msdn.microsoft.com/Forums/en-US/wcf/thread/0eb69998-0388-4731-913e-fb205528d374/

http://msdn.microsoft.com/en-us/library/ms731184.aspx

Actually the really cool thing is that you can have multiple applications listening this way too. So you can display it on screen, and have another application log it etc. without the two external apps knowing anything about each other.

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