Looking for third party SerialPort solution [closed]

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I'm looking for a third party Serial Port solution (commercially or open-source are equally welcome). There are some known bugs in .NET Serial Port class that gives me all sorts of threading errors. Does any know of any good third party solution that works for C# WPF application?

[EDITED] I have encountered similar problems to this

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USB or RS-??? (232, 435, etc)?

Just googling a little:

Open source:

• http://sourceforge.net/projects/serialportnet/

Comercial:

• http://www.marshallsoft.com/serial-communication-library.htm
• http://www.zylsoft.com/serialportnet.htm

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try http://www.commstudio.com/commstudio