get sha-256 value from a file

i use this code to get the MD5 hash of a file (extracted from this post)

[code]dim mdfive as new MD5Digest
dim bs as BinaryStream = BinaryStream.Open( f )
while not bs.EOF
dim chunk as string = bs.Read( 1000000 )
mdfive.Process chunk

dim hash as string = EncodeHex( mdfive.Value )[/code]

how do i get the sha-256 value from a file?

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