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Hi Dears,
I have a loop for poling a byte for some value,
it is to stay untill device sends the byte. I want to know how I can modify the code so I may run this loop for specified duration after which the loop goes to end.
thank you

I would use Monitor.Wait and set it to timeout. Put the receivebyte logic into a separate thread, then use the Monitor to control it. Take a look at Monitor.Wait and Monitor.Pulse (you'll need Pulse to "wake" the master thread back up if you receive the byte you are waiting for).
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if you don't want to use a separate thread then you can modify your code like following

while((time_out-- > 0) && (receivebyte == null));

Note that this doesn't guarantee that you will timeout at a specific time (you'd probably want to use a time check for that). Rather, it simply states that you will timeout after a particular loop count is reached.
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