C# method need for converting text to graphics

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I'm looking for some method, possibly in a .Net class that I don't
about, for converting a text image to an image file in GIF or
JPEG format. The application is a form (could be a Web form
or a Windows form on an Internet-connected computer) where
the user types the contents of a randomly generated string
which is displayed in the form of an image.

You would encounter such a form, for instance, when
registering a software product, or submitting some kind
of information on a form that you don't want submitted
by an automated mass mailer... in other words, a spammer.
The string on the image must be manually typed
in order to submit the form.

Generating the string is no problem. Rasterizing it to
an image is the big deal.

Anyone know of a method, preferably in C#?

.



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