comparer variable dim server sql

bonjour, je souhaite comparer une variable dim qui sera différente sur chaque ordinateur (id processeur, id hdd, id mb,id mac) avec ma base de données sql. si elle est enregistrer sur mon server le soft s'ouvre sinon il se ferme. j'ai passez plusieurs jours je ne trouve pas.. voila mon code :

Code:

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Public Class Form1
    Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
        Dim web As New WebClient
        Dim hw As New ClsComputerInfo
 
        Dim hdd As String
        Dim cpu As String
        Dim mb As String
        Dim mac As String
        Dim hwid As String
 
        cpu = hw.GetProcessorId()
        hdd = hw.GetVolumeSerial("C")
        mb = hw.GetMotherBoardID()
        mac = hw.GetMACAddress()
        hwid = cpu + hdd + mb + mac
 
        Dim hwidEncrypted As String = Strings.UCase(hw.GetMD5Hash(cpu & hdd & mb & mac))
 
        Dim SQL As String = String.Empty
        SQL &= "SELECT * FROM HWID "
        If Not String.IsNullOrEmpty(hwidEncrypted) Then
 
            Dim UserData As DataTable = ExecuteSQL(SQL)
 
            If SQL.Contains("hwidEncrypted") Then  
 
            Else
                Close()
 
            End If
        End If

Code:

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Module SQLSERVERCONNECTION
 
Public StringConnection As String = "Data Source=********;Initial Catalog=USERLOGINHWID;Integrated Security=True"
 
    Function ExecuteSQL(sql As String) As DataTable
 
        Try
            Dim connection As New SqlConnection
            Dim adapter As SqlDataAdapter
            Dim dt As New DataTable
 
            connection.ConnectionString = StringConnection
            connection.Open()
 
            adapter = New SqlDataAdapter(sql, connection)
            adapter.Fill(dt)
 
 
            connection.Close()
            connection = Nothing
 
            Return dt
 
 
        Catch ex As Exception
            ' an erreur occured
 
        End Try
 
 
 
 
 
    End Function
 
 
End Module

merci a vous