How to create serial key in customer information dialog box

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C#3.0

C#

deployment

Hi friends.

I have created project in C# and now I want to deploy it on client pc.
I want to use a serial key to client to active it. I have added customer information dialog box in click once deployment.
But when we add it it takes only default serial key; meaning whose sum divided by 7 get 0. It only get pass not other but I want to create my own keys it should contains letters like this "sdw32-sd23d-sd35f-" so now to change <###-%%%%%%%> such serial no templates who will take letters also.

Please help me thanks