>And also
>(1) Dispose() ( or with using) is never called in the example
>SHA256Managed derives from HashAlgorithm http://msdn.microsoft.com/en-us/library/system.security.cryptography.hashalgorithm(v=vs.110).aspx
>

>            SHA256 mySHA256 = SHA256Managed.Create();
>

>
>(2) Since the property CanReuseTransform returns true http://msdn.microsoft.com/en-us/library/System.Security.Cryptography.SHA256(v=vs.110).aspx
>When you need to calculate the hash for a list of files (as per the example) you can instantiate SHA256Managed only once
>
>
>Same applies to MD5 or anything else deriving from HashAlgorithm

Thanks, this is useful to know.