Yes.
I know the problem, that lots of management people don't know that excel is not a network application.
This might change with .NET, but I know not very much about it.
With
Java.
There is a openSource java Api with which you can read and create Excel files.
poi
HSSF (Horrible Spreadsheet Format)
HSSF is our port of the Microsoft Excel 97(-2002) file format (BIFF8) to pure Java. It supports read and write capability. Please see the HSSF project page for more information.
1. You might do all the validation stuff before uploading with visual basic.
2. Process the uploaded file on the web server with poi.
3. It should be possible.
Axel