Recognize Drawing?

[Mony Mony]

Ok guys..I have a portable pc and I use it very often,Now Im making visual basic 2008 apps and is working just fine with the touch screen.I wondered how to make this things?
When I draw a circle on the picturebox , I want the software to recognize it..
Just like the project shown here:
JavaScript $1 Unistroke Recognizer

Thanks for any help..!