asp.net virus scanner

I am uploading video and image files from a webpage to a filesystem using asp.net and C#. I need a way, when a user attachs a file and clicks submit that a virus scanner is used to scan the attachment for viruses. This is very similar to yahoo when they do this. I would prefer a free virus scanning software (as long as the virus definition files are up to date) however, commercial one will do as well. Please see: [login to view URL] ## Deliverables 1) Complete and fully-functional working program(s) in executable form as well as complete source code of all work done. 2) Deliverables must be in ready-to-run condition, as follows (depending on the nature of the deliverables): a) For web sites or other server-side deliverables intended to only ever exist in one place in the Buyer's environment--Deliverables must be installed by the Seller in ready-to-run condition in the Buyer's environment. b) For all others including desktop software or software the buyer intends to distribute: A software installation package that will install the software in ready-to-run condition on the platform(s) specified in this bid request. 3) All deliverables will be considered "work made for hire" under U.S. Copyright law. Buyer will receive exclusive and complete copyrights to all work purchased. (No GPL, GNU, 3rd party components, etc. unless all copyright ramifications are explained AND AGREED TO by the buyer on the site per the coder's Seller Legal Agreement). ## Platform microsoft .net c# asp.net