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    <p>If your purpose is to compare 2 files to see if the contents are the same, without regards to the information about the file (ie, modified date, name, type, etc.) you should use a hash on both the files. Here is some code I have used for a while. There are many ways to do this.</p> <pre><code>''' &lt;summary&gt; ''' Method to get a unique string to idenify the contents of a file. ''' Works on any type of file but may be slow on files 1 GB or more and large files across the network. ''' &lt;/summary&gt; ''' &lt;param name="FI"&gt;System.IO.FileInfo for the file you want to process&lt;/param&gt; ''' &lt;returns&gt;String around 50 characters long (exact length varies)&lt;/returns&gt; ''' &lt;remarks&gt;A change in even 1 byte of the file will cause the string to vary ''' drastically so you cannot use this to see how much it differs by.&lt;/remarks&gt; Public Shared Function GetContentHash(ByVal FI As System.IO.FileInfo) As String Dim SHA As New System.Security.Cryptography.SHA512Managed() Dim sBuilder As System.Text.StringBuilder Dim data As Byte() Dim i As Integer Using fs As New IO.FileStream(FI.FullName, IO.FileMode.Open) data = SHA.ComputeHash(fs) fs.Flush() fs.Close() End Using sBuilder = New System.Text.StringBuilder ' Loop through each byte of the hashed data ' and format each one as a hexadecimal string. For i = 0 To data.Length - 1 sBuilder.Append(data(i).ToString("x2")) Next i Return sBuilder.ToString() End Function </code></pre> <p>You need to run this on each file, to come up with a string that uniquely identifies the file, then compare the 2 strings.</p>
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    1. POHow do i compare byte arrays in vb.net
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    1. USSteve
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    1. COIf you have a group of files (a, b, c, d) and you want to know if a=b and c=d then generating a hash will take more time than just comparing the bytes. If you want a=b, a=c, and a=d then there might be some time savings.
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    2. CO@Steve what does the "x2" mean in the last For loop?
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      1. USAfnan Makhdoom
    3. CO@AfnanMakhdoom - please make some attempt to do your own research. http://msdn.microsoft.com/en-us/library/dwhawy9k.aspx
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