How to create a math captcha image?

How to create a math captcha image in using C#?
Something like this: . The link I am sharing here is for a captcha created in Asp, I am in need of same thing in using C#.

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Why not to use reCAPTCHA? Or wheel is not invented yet? :)
TheMakAuthor Commented:
Those above are simple captcha, I want math captcha example 12+6=          ............
The user should enter the sum of those numeric value to proceed further. Below link contain same thing but in asp and I need to do that in 

TheMakAuthor Commented:
Thanks guys I got the solution from this site
I have downloaded the source code and its working fine. We will modify according to our need....


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TheMakAuthor Commented:
I am still looking for Math captcha and might be more interesting what I got. Please provide me some more help on math captcha ways..

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