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Download ASP.Net file with CRC check

Is there a file upload control for ASP.Net that calculates the client-side checksum (CRC, MD5, etc.) in the contents of the file and passes the checksum to enable server-side checksum verification?

I looked at the answers to several questions about downloading files, but did not find this feature anywhere.

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From javascript, you will not be able to determine the file size on the client computer. Javascript runs inside the sandbox and cannot access local system files, which would be a security violation.

You can use silverlight and can get the file size and calculate the amount. You can check it out

Silverlight File Upaod

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You will need a client code to open the file, calculate this checksum and send it to your web server with the contents of your file; you cannot do this with simple javascript, since you should not have access to your user filesystem.

But just like @ Dan Herbert , commented out your question to use this client application, such as Flash, Java applet or Silverlight. I just wanted to make a more complete answer and explain why you cannot do this.

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Source: https://habr.com/ru/post/1298994/

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