How to find serial port is busy or not in c#

can any help me to find weather serial port is busy or not via c# code if so mail me at
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  1. We don't email anybody. A public forum gets a public reply so everybody can see the answer and use it too. Private answers=no answers.

    People want the answer emailed because they have posted the question to many forums and they don't want to track down where they posted them all to looking for somebody that may have answered them.

    Do your own homework.
  2. ok tell me the answer for the question i can't find any answer sir...................
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