For some time there were problems with USB SerialPort adapters. Probably the easiest way to see the difficulty was to pull the USB adapter while the port was in use. What resulted seemed to depend on some set of factors that I never fully understood. What I saw was my programs crash, or the SerailPort would not be usable until the PC was rebooted, or both, or etc...

Recently I tested the .Net 4.0 SerialPort by pulling the adapter while the port was in use. My program did not crash, and I was able to re-use the port without restarting my PC. I am hoping that others that regularly use the SerialPort will post comments about their experience with .Net 4.0.

Dewayne