Based on my knowledge, there is no managed class for the TWAIN so far. We
have to do that by P/Invoke the Twain_32.dll to do the job.
Here is .net sample, you may take a look.
.NET TWAIN image scanner http://www.codeproject.com/dotnet/twaindotnet.asp
Best regards,
Peter Huang
Microsoft Online Partner Support
Get Secure! - www.microsoft.com/security
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