Antivirus scanning files uploaded to SQL blob

We have a request to develop a file sharing component of a .net application to allow a client to upload files and have others download those files.  The files will be saved to SQL as blob within the database, so we're not concerned with our infrastructure, but am concerned if a user uploads an infected file and it gets propagated.  We then become the mechanism that spread their infection.  We plan on getting a release of liability but I want to explore options to scan the file before SQL gets it.  We use AVG Corporate, but I don't think there are any web scanning options there.  

Any recommendations on a web server side component that would allow for scanning prior to handing off to SQL?
mchad65Asked:
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David Johnson, CD, MVPOwnerCommented:
can you do a scan on demand of a folder?
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Athar SyedCommented:
You are uploading to a temporary file on the server, which is then being inserted into your DB. If you are not doing, this step, you probably should be doing it, in order to scan them before uploading them. You can also create a Windows Service which will scan the file and insert them in the DB. In this case, your web page will upload the files to the upload folder and trigger the windows service for that file.

AFAIK all antivirus applications have an Scan-On-Demand feature. Some allow from command line, others permit to be called only from the core application. So research and choose your antivirus as per your requirement.

Also to be safe, rename the uploaded files with an additional .tmp extension, scan them, then save them in the DB without the .tmp extension. This is to avoid executable applications on the web server.
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