Aide avec mon programme decryptage MD5

bonjour, voila j'ai un petit problème avec mon programme quand je lance il m'affiche aucun résulta. pouvez-vous m'aider a résoudre ce problème.
voici en image:
http://imageshack.us/a/img90/9764/de...emd5erreur.jpg
mes codes:

Code:

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Public Class Form1
 
    Private ObjCmd5 As New Cmd5
 
    Private Sub Form1_Load(sender As System.Object, e As System.EventArgs) Handles MyBase.Load
 
    End Sub
 
    Private Sub Button4_Click(sender As System.Object, e As System.EventArgs) Handles Button4.Click
        TextBox1.Paste()
        Button1.Enabled = True
    End Sub
 
    Private Sub Button1_Click(sender As System.Object, e As System.EventArgs) Handles Button1.Click
        Dim text As String = TextBox1.Text
        Dim alphabet As String = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789!#$%&'()*+,-./:;<=>?@[\]^_'{|}~"
        Dim stopwatch As New Stopwatch
        Dim max As Integer = 1
        stopwatch.Start()
        TextBox2.Text = ("" & 1)
        If ObjCmd5.CassMd5("", 1, alphabet, [text]) Then
            Do
                max += 1
                stopwatch.Start()
                TextBox2.Text = ("" & max)
            Loop While ObjCmd5.CassMd5("", max, alphabet, [text])
        End If
        TextBox3.Text = ObjCmd5.RetourChaine
        stopwatch.Stop()
        Dim elapsedMilliseconds As Integer = CInt(stopwatch.ElapsedMilliseconds)
        MessageBox.Show(("Trouvé en : " & CStr((elapsedMilliseconds * 0.001)) & " sec"))
    End Sub
 
    Private Sub Button2_Click(sender As System.Object, e As System.EventArgs) Handles Button2.Click
        TextBox1.Clear()
        TextBox2.Clear()
        TextBox3.Clear()
        Button1.Enabled = False
    End Sub
 
    Private Sub Button3_Click(sender As System.Object, e As System.EventArgs) Handles Button3.Click
        Application.Exit()
    End Sub
 
    Private Sub LANCEMENTLOGICIELMD5ToolStripMenuItem_Click(sender As System.Object, e As System.EventArgs) Handles LANCEMENTLOGICIELMD5ToolStripMenuItem.Click
        Form2.Show()
    End Sub
End Class

Code:

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Imports System.Runtime.InteropServices
Imports System.Text
Imports System.Security.Cryptography
 
Class Cmd5
 
    Public Function CalcMd5(ByVal sChaine As String) As String
        Dim bytes As Byte() = New ASCIIEncoding().GetBytes(sChaine)
        Dim buffer As Byte() = New MD5CryptoServiceProvider().ComputeHash(bytes)
        Dim builder As New StringBuilder(buffer.Length)
        Dim index As Integer = 0
        If (0 < buffer.Length) Then
            Do
                builder.Append(buffer(index).ToString("X2"))
                index += 1
            Loop While (index < buffer.Length)
        End If
        Return builder.ToString
    End Function
 
    Public Function CassMd5(ByVal chaine As String, ByVal max As Integer, ByVal alphabet As String, ByVal CrypterPass As String) As <MarshalAs(UnmanagedType.U1)> Boolean
        If (chaine.Length = max) Then
            If (CalcMd5(chaine) = CrypterPass) Then
                RetourChaine = chaine
                Return True
            End If
            Return False
        End If
        Dim num As Integer = 0
        Do
            If CassMd5((chaine & alphabet.Chars(num)), max, alphabet, CrypterPass) Then
                Return True
            End If
            num += 1
        Loop While (num < &H24)
        Return False
    End Function
    Public RetourChaine As String
End Class

voici mon projet dans pièces jointe.

Merci,cordialement