I have developed a web based application in ASP.NET and C# where users have the facility to upload files on the server through this application I want the application to Scan th
Just purchase antivirus software that has a command-line interface (several popular packages include this). Once the file has been uploaded, run the scan.
I would think, in order to upload and scan at the same time, you might need to implement your own antivirus software as I'm not familiar with any package that would provide that sort of interface.
I run a shareware site. It doesn't work as you described, but I download each file to my local computer and run a scan on them. You would be doing something similar.