Generate notifications using messaging
We have a custom workflow implemented in c#.
We now need to implement the cut-off times for transitions.
This means ..lets say that if my entity undergoes a state transition at 10:00 AM , the next transition should take place in say ...the next 20 minutes .
So if at 10:20 AM , the next transition still has not taken place , I need to generate
a notification message.

What are the options that I have to implement this ... besides creating a polling service which checks for time outs at periodic intervals.

Will a messaging solution help .. how ?

Thanks 
Generate notifications using messaging
===

We have a custom workflow implemented in c#.
We now need to implement the cut-off times for transitions.
This means ..lets say that if my entity undergoes a state transition at 10:00 AM , the next transition should take place in say ...the next 20 minutes .
So if at 10:20 AM , the next transition still has not taken place , I need to generate
a notification message.

What are the options that I have to implement this ... besides creating a polling service which checks for time outs at periodic intervals.

Will a messaging solution help .. how ?

Thanks 