How to find the First Mac address in a netwrok card wether is changed.

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hi all.
i finished the Windows application in VS C# 2010. Application expiry date validate in online web service with database. i identify my client in
the Mac address. i store client mac address and expiry date in my webservice db. i trust mac address is unique and never changed . but last
day i found a mac address changing application. :(
if i changed a mac address 1 time , how to get old mac address ( mac address on before change.) please help.
<hr class="sig rageshS

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