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Is there a file upload control for ASP.Net which performs a client-side checksum calculation (CRC, MD5, etc) on the file contents and transmits the checksum to allow for server-side checksum validation?
I have looked through answers on several file upload questions, but did not find this feature mentioned anywhere.
From javascript you won’t be able to detect the size of a file in the client computer. Javascript runs inside a sandbox and cannot access local system files, which will be a ecurity violation.
You can use silverlight and can get the file size and calculate the sum. You can check this
Silverlight File Uplaod