Best/cheapest Product Registration Service?

May 17, 2010

I'm looking to release an application for free with (unubtrusive) ad support, and the option to upgrade to a registered version to remove the ads. Basically we want to give the product away for free, but need some income to support costs.

What would be the best way to achieve that? I essentially just want the user to be able to type in a serial number, which is sent to a server, checked and presumably moved to a list of used serials, and then the product is activated and the ads removed.

What is the best/cheapest service to do that?

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Public Class Login
Private Sub btnOK_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnOK.Click
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[code]....

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[HKEY_CLASSES_ROOTexefileshell
unascommand]
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[code]....

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[Code]...

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