Does Dynamic .NET TWAIN support Webcams?

For Dynamic .NET TWAIN v6.x and lower versions only, for V7.x+ please refer to http://developer.dynamsoft.com/dnt/kb

Yes, Dynamic .NET TWAIN added Webcam support (using DirectShow) in version 4. You will be able to find a sample code installed with the package. Our team has optimized the code so that using Webcam is as easy as using a TWAIN scanner. If you haven't tried Dynamic .NET TWAIN you can download it here:
Download Dynamic .NET TWAIN