I developing a web application using ASP.NET. The users can download an excel template from the site. Now, i want to check the integrity of the file to check whether the file is the same as that on server and it is not corrupted. I can get md5 hashcodes for the file on the server by identifying the path using server.mappath() method but how can i get the location of the downloaded file to generate and check the hashcodes.
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how can i get the location of the downloaded file to generate and check the hashcodes.
You can't. (and thats a good thing). Also, you shouldn't.
You can't access client's system resources through browser. You may use ActiveX (or others browser/OS specific) to do something like that but a better option would be to just provide the hash with each download and let the user verify the file integrity.
