Manage timer tick event on Another timer tick

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I have an application that reads a tag and then process according to it. Currently I have set the timer to tick for per second and the function(includes Image shown from database accordingly) is called on that tick event.
But now I want to manage that tick event on another tick event i.e for count down timer. I want the first timer to tick as it is but to add a new timer to maintain count down if the first timer reads the same tag repeatedly and if time elapses more than 2 minutes then clear the image from the form. And if before that the first timer tick gets a new tag than replace the previous image from the current one...

Now the problem is coming to manage both timer with current requirements.
Any clue, help, guide any thing in this regard will be heartly accepted. And thanks in advance.

Posted 15-Dec-13 21:58pm

kool15th

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BillWoodruff 16-Dec-13 6:38am

Under what circumstances would a tag be processed more than once ?

If a tag is repeated, isn't there some reason like, for example, you use the same graphic file in more than one place on your Form ? I can imagine a scenario where you want to read-in and "cache" images in some way ... like making them into a Resource ... and then re-use them multiple times: is that what's going on here ?

2 solutions

Solution 2

I would use just one timer and a state machine[^] inside the tick event handler.

Posted 15-Dec-13 22:14pm

CPallini

Updated 16-Dec-13 0:37am

v2

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BillWoodruff 16-Dec-13 6:33am

Correct link is:

http://en.wikipedia.org/wiki/Finite-state_machine

But, I do not think this is an appropriate referral for a relative newcomer to .NET and, probably, programming.

CPallini 16-Dec-13 6:38am

Thank you, now the link is fixed.
Sooner or later a programmer has to know that, in my opinion.

kool15th 18-Dec-13 0:40am

thanks...I will Try It for sure.

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lukeer · Accepted Answer · 2013-12-15T22:08:00

The other timer then is a sort of "Timeout watcher". It works something like this:

1) Start timeoutTimer.

2) Let your firstTimer work as usual,

3) Plus save a copy of the tag in some member variable.

4) Within firstTimer's Tick event, let it check if tag has changed and if so, reset timeoutTimer. So whenever firstTimer ticks, it postpones timeoutTimer's Tick. Just if firstTimer fails to do something within timeoutTimer's interval, its event handler is called.

5) On timeoutTimer's Tick event, do whatever the timeout requires to be done.