Need a touch screen "keyboard" in C#

I plan on writing my first touch screen application, and hope to find the code needed to represent the keyboard for the user to enter A-Z and 0-9.  This is for a POS Point of Sale application.

Does anyone know where I can download that code in C#?

And when it comes to data entry speed, is it really faster than a keyboard and a mouse?

I need the user to enter the following information:
1) order number
2) phone number of customer
3) address of customer

is it really faster to use a touch screen for this?

I find that searching for the right letter is slower on a touch screen than using a keyboard, personally.  But I'd love to hear your opinions.

thanks,
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