Visual Basic Error Generating Folder SHA256 Hash - vb.net

Question

I want to generate a single SHA256 hash of all the files in a folder in visual basic. I have tried the following code but it generates individual hashes of all files inside the folder, but not a single hash. Can anybody please help.
Private Sub Button5_Click(sender As Object, e As EventArgs) Handles Button5.Click
Dim directory As String
If TextBox2.Text.Length < 1 Then
Dim fdb As New FolderBrowserDialog
Dim dr As DialogResult = fdb.ShowDialog()
If (dr = DialogResult.OK) Then
directory = fdb.SelectedPath
Else
MsgBox("No directory selected")
Return
End If
Else
directory = TextBox2.Text
End If
Try
' Create a DirectoryInfo object representing the specified directory.
Dim dir As New DirectoryInfo(directory)
' Get the FileInfo objects for every file in the directory.
Dim files As FileInfo() = dir.GetFiles()
' Initialize a SHA256 hash object.
Dim mySHA256 As SHA256 = SHA256Managed.Create()
Dim hashValue() As Byte
' Compute and print the hash values for each file in directory.
Dim fInfo As FileInfo
For Each fInfo In files
' Create a fileStream for the file.
Dim fileStream As FileStream = fInfo.Open(FileMode.Open)
' Be sure it's positioned to the beginning of the stream.
fileStream.Position = 0
' Compute the hash of the fileStream.
hashValue = mySHA256.ComputeHash(fileStream)
' Write the name of the file to the Console.
MsgBox(fInfo.Name + ": ")
' Write the hash value to the Console.
PrintByteArray(hashValue)
' Close the file.
fileStream.Close()
Next fInfo
Return
Catch DExc As DirectoryNotFoundException
MsgBox("Error: The directory specified could not be found.")
Catch IOExc As IOException
MsgBox("Error: A file in the directory could not be accessed.")
End Try
End Sub
Public Function PrintByteArray(ByVal array() As Byte)
Dim i As Integer
For i = 0 To array.Length - 1
Label3.Text = (String.Format("{0:X2}", array(i)))
If i Mod 4 = 3 Then
Label3.Text = (" ")
End If
Next i
Return Label3.Text
End Function 'PrintByteArray

Answer 1

You can combine the hashes with XOR to give one 256-bit hash (32 bytes). Because XOR is associative (A XOR B = B XOR A), it does not matter in which order you XOR the file hashes together. You will have to XOR the individual bytes of each hash: Most efficient way to xor byte array in vb.net.