你不能只用ASP.Net，

但你可以去SilverLight，

这是一个例子关于如何使用SilverLight从WIA支持的设备扫描图像：

http://10rem.net/blog/2010/04/14/scanning-an-image-from-silverlight-4-using-wia-automation



这个例子是关于从浏览器运行solverlight，我不确定你是否可以从用户的浏览器做同样的事情。但我不认为这是可能的。



所以我只能想到只有IE支持的ActiveX。或Java小程序。

谷歌他们。你可以找到JTWIN和TWIN ActiveX的好结果

You can't do that only with ASP.Net,
But you can go for SilverLight,
Here is an example about how to scan an image with SilverLight from WIA supported devices:
http://10rem.net/blog/2010/04/14/scanning-an-image-from-silverlight-4-using-wia-automation

This example is about running solverlight out of browser, I am not sure if you can do same thing from user's browser or not. But i don't think this could be possible.

So I only can think about ActiveXs that are only supported by IE. Or Java applets.
Google them. You can find good results for JTWIN and TWIN ActiveX