Почему этот код Visual Basic не дает никаких результатов?

Я запускаю этот код в проекте формы приложения Windows в Visual Basic. Этот код должен дать мне байты CRC-32 для массива байтов, но что бы я ни делал, я не могу вывести ни одного байта. Извините, если есть что-то действительно очевидное, что мне здесь не хватает, но я уже пробовал «MsgBox», «немедленный экран» с «debug.print», а также пробовал печатать байты внутри текстового поля, но безрезультатно. Я ценю это, если вы сможете помочь мне с этим.

Public Class Form1

Public Sub Main()

    Dim lCrc32Value As Long

    On Error Resume Next
    lCrc32Value = InitCrc32()
    lCrc32Value = AddCrc32("This is the original message!", _
       lCrc32Value)
    'Debug.Print(Hex$(GetCrc32(lCrc32Value)))

    TextBox1.Text = (Hex$(GetCrc32(lCrc32Value))).ToString
End Sub
'// Then declare this array variable Crc32Table
Private Crc32Table(255) As Long
'// Then all we have to do is write public functions like
'these...
Public Function InitCrc32(Optional ByVal Seed As Long = _
   &HEDB88320, Optional ByVal Precondition As _
   Long = &HFFFFFFFF) As Long

    '// Declare counter variable iBytes, 
    'counter variable iBits, 
    'value variables lCrc32 and lTempCrc32

    Dim iBytes As Integer, iBits As Integer, lCrc32 As Long
    Dim lTempCrc32 As Long

    '// Turn on error trapping
    On Error Resume Next

    '// Iterate 256 times
    For iBytes = 0 To 255

        '// Initiate lCrc32 to counter variable
        lCrc32 = iBytes

        '// Now iterate through each bit in counter byte
        For iBits = 0 To 7
            '// Right shift unsigned long 1 bit
            lTempCrc32 = lCrc32 And &HFFFFFFFE
            lTempCrc32 = lTempCrc32 \ &H2
            lTempCrc32 = lTempCrc32 And &H7FFFFFFF

            '// Now check if temporary is less than zero and then 
            'mix Crc32 checksum with Seed value
            If (lCrc32 And &H1) <> 0 Then
                lCrc32 = lTempCrc32 Xor Seed
            Else
                lCrc32 = lTempCrc32
            End If
        Next

        '// Put Crc32 checksum value in the holding array
        Crc32Table(iBytes) = lCrc32
    Next

    '// After this is done, set function value to the 
    'precondition value
    InitCrc32 = Precondition

End Function

'// The function above is the initializing function, now 
'we have to write the computation function
Public Function AddCrc32(ByVal Item As String, _
  ByVal Crc32 As Long) As Long

    '// Declare following variables
    Dim bCharValue As Byte, iCounter As Integer, lIndex As Long
    Dim lAccValue As Long, lTableValue As Long

    '// Turn on error trapping
    On Error Resume Next

    '// Iterate through the string that is to be checksum-computed
    For iCounter = 1 To Len(Item)

        '// Get ASCII value for the current character
        bCharValue = Asc(Mid$(Item, iCounter, 1))

        '// Right shift an Unsigned Long 8 bits
        lAccValue = Crc32 And &HFFFFFF00
        lAccValue = lAccValue \ &H100
        lAccValue = lAccValue And &HFFFFFF

        '// Now select the right adding value from the 
        'holding table
        lIndex = Crc32 And &HFF
        lIndex = lIndex Xor bCharValue
        lTableValue = Crc32Table(lIndex)

        '// Then mix new Crc32 value with previous 
        'accumulated Crc32 value
        Crc32 = lAccValue Xor lTableValue
    Next

    '// Set function value the the new Crc32 checksum
    AddCrc32 = Crc32

End Function

'// At last, we have to write a function so that we 
'can get the Crc32 checksum value at any time
Public Function GetCrc32(ByVal Crc32 As Long) As Long
    '// Turn on error trapping
    On Error Resume Next

    '// Set function to the current Crc32 value
    GetCrc32 = Crc32 Xor &HFFFFFFFF

End Function
'// And for testing the routines above...



End Class