Serial communications - OnComm Event

I am developing a Windows Service which monitors the Rs232 port for incoming text streams (Strings). I have been able to build a class to operate the port but am having difficulty in figuring out how to fire a received event. The only thing I can think of is to fire a timer to look for the End of Text character in the string and then search backward through the string to find the Start of Text character. Then load that string into a variable for processing. Any thoughts or ideas? Thanks in advance
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