Execute Statement After Specific Time

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C#5.0

So here is the problem, the program that I am currentyl working on takes samples of ten via the serial port and writes them to a file.
Now however, I want to take three samples, so take first sample then wait a specific time, then execute the next sampl and so on. I have read that Threading.Sleep() effects events, My serial port is event driven is there a another method that exists that can either count down or up to a time??