Had you chosen to read the Guidelines for asking a question, you would already have an answer. :)
A quick google search of your exact question brought up this article in the first page of results.
Retrieving Motherboard Serial Number using WMI[
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Next time you have a question, please read the following that appears at the bottom of the ask a question form:
A few simple rules when posting your question.
1) Have you searched or Googled for a solution?
2) Be specific! Don't ask "I need to write a booking application". Specify exactly what it is you need help with.
3) Keep the subject brief but descriptive. eg "How do I change the dialog colour?"
4) Keep the question as concise as possible. If you have to include code, include the smallest snippet of code you can - do not dump your entire codebase.
5) Tag your question appropriately.
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