Vbulletin Hack loader login system

Imports System.Security.Cryptography
Imports System.Text
Imports System.Net
Imports System.IO
Module Module1
    Public Function Login(ByVal Username As String, ByVal Password As String)

        Password = MD5(Password)
        Dim valid As Boolean = False
        Dim data As String = "vb_login_username=" & Username & "&vb_login_password=&s=&do=login&vb_login_md5password=" & Password & "&vb_login_md5password_utf=" & Password

        Try
            Dim request As HttpWebRequest = WebRequest.Create("YOURURLHERE/login.php?do=login")
            request.Method = WebRequestMethods.Http.Post
            request.ContentType = "application/x-www-form-urlencoded"
            request.UserAgent = "-- vBulletin Vaidation  --"



            request.ContentLength = data.Length

            Dim rStream As New StreamWriter(request.GetRequestStream)

            rStream.Write(data)
            rStream.Flush()
            rStream.Close()

            Dim response As HttpWebResponse = request.GetResponse
            Dim resReader As New StreamReader(response.GetResponseStream)

            Dim str As String = resReader.ReadToEnd


            If str.Contains("Successful Login!") Then
                valid = True
            Else
                valid = False
            End If


            response.Close()

        Catch ex As Exception
            MessageBox.Show(ex.Message, "Error URFORUMNAME Forums-Login!", MessageBoxButtons.OK, MessageBoxIcon.Error)

        End Try

        Return valid

    End Function

    Public Function MD5(ByVal number As String) As String

        Dim ASCIIenc As New ASCIIEncoding
        Dim strReturn As String = String.Empty

        Dim ByteSourceText() As Byte = ASCIIenc.GetBytes(number)
        Dim Md5Hash As New MD5CryptoServiceProvider
        Dim ByteHash() As Byte = Md5Hash.ComputeHash(ByteSourceText)

        For Each b As Byte In ByteHash
            strReturn &= b.ToString("x2")
        Next

        Return strReturn

    End Function
End Module

 Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load

MsgBox("STARTING MESSEGE OF YOUR CHOICE GOES HERE")

   If CheckBox1.Checked Then
            My.Settings.mystring.Add(ComboBox1.Text)
            ComboBox1.Items.Add(ComboBox1.Text)
            My.Settings.Save()
        End If
    End Sub

If Login(ComboBox1.Text, TextBox1.Text) Then
            MsgBox("Successfully Logged In! WELCOME!")
            Form2.Show()
            Me.Close()

        Else
            MsgBox("Incorrect Username/Password")
        End If