check out the sample that comes with the msdn library called:
VB.NET - Framework - Using the COM Port in VB.NET
There is a module they use called "RS232". Add that to your program them check out the examples in that sample. Taht is what I did and it works great once you figure out what they are doing in the sample.
Just a footer note... If you download the new MSDN toolkit it brings some nice free components. One of them it's one from SAX.net wicth does a serial comunication.
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