VintaSoftTwain.NET Library is a pure .NET Library which allows to
control work of scanners, cameras and any other TWAIN devices. With
this library you can fully control the image acquisition process,
control an work of ADF, save acquired images as BMP, JPEG, PNG, GIF or
TIFF files onto local disk or directly into a SQL database, upload
images onto Web or FTP server. Library was tested and has examples of
use in: MS VB.NET, MS C#, Borland Delphi 8.0, Borland C# Builder,
ASP.NET.

What's new in this version:
- The image transfer mode has been changed from a Native transfer to a
Memory transfer. This will reduce a quantity of used memory.
- The stack overflow error which occurs on some devices has been
corrected.

You can see more info about library here:
http://www.vintasoft.com/vstwain-dotnet-index.html.