How to scan files during uploads with the use of FileUpload asp.net server control

In continuation to my previous research at this link : Security Risks or concerns with the use of FileUpload control of asp.net - and suggested solutions

I need to know how to Scan files during upload, also how to intimate user if file is virus affected and abort the operation.

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Any answer for this highly appreciable.

Thanks in advance!

Edited - In addition to above, we have McAfee Antivirus installed on our servers. I heard that there is some APIS for this work for Symantac Antivirus but I am not sure about McAfee antivirus.

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I need to know how to Scan files during upload, also how to intimate user if file is virus affected and abort the operation.

You mean a virus scan while a file is being uploaded from the client? This is hardly possible using standard tools.

Scan the file after it has been uploaded; delete the file and show the user a reject message if anything malicious was found.