Type is not defined

Hi,

I have a create a new project (Control Library). And I am using this code. However it returns the following error:
Type 'PasswordDeriverBytes' is not defined regarding the SetKey function. (highlighted in bold) What am I missing out. I originally took this code from a windows form (for a desktop not PPC).

I really need to get this fixed.

Thanks in advance

VB Code:

Imports System.Security.Cryptography
Imports System.IO
Public Class PDACrypt
    Public Sub New()
        MyBase.New()
        InitializeComponent()
        clientRC2CryptoServiceProvider = New RC2CryptoServiceProvider()
    End Sub
 
    Public Shared clientRC2CryptoServiceProvider As RC2CryptoServiceProvider
 
    Private Function SetEncKey(ByVal pwd As String) As Byte()
        Dim drive As Long
        Dim rnd As Random
        rnd = New Random
        Dim byts(7) As Byte '8 bytes
        rnd.NextBytes(byts)
        SetKey(pwd, byts)
        Return byts
    End Function
    Private Sub SetDecKey(ByVal pwd As String, ByVal salt As Byte())
        Dim drive As Long
        SetKey(pwd, salt)
    End Sub[b]
    Private Sub SetKey(ByVal pwd As String, ByVal salt As Byte())
        Dim deriver As PasswordDeriveBytes
        deriver = New PasswordDeriveBytes(pwd, salt)
        clientRC2CryptoServiceProvider.Key = deriver.GetBytes(clientRC2CryptoServiceProvider.LegalKeySizes(0).MaxSize \ 8)
        clientRC2CryptoServiceProvider.IV = deriver.GetBytes(clientRC2CryptoServiceProvider.BlockSize \ 8)
    End Sub[/b]
    Public Function EncryptFileRC2(ByVal pwd As String, ByVal fin As String, ByVal feout As String)
        Dim fileStream As FileStream
        Dim lngFileLength As Double = 0
        fileStream = File.OpenWrite(feout)
        Dim writeStream As BinaryWriter
        writeStream = New BinaryWriter(fileStream)
        Dim myByte As Byte
        Dim salt() As Byte
        salt = SetEncKey(pwd)
        Try
            Dim i As Integer
            For i = 0 To salt.Length - 1
                writeStream.Write(salt(i))
            Next
            writeStream.Flush()
        Catch
        End Try
        Dim encryptor As ICryptoTransform
        encryptor = clientRC2CryptoServiceProvider.CreateEncryptor()
        Dim encStream As CryptoStream
        encStream = New CryptoStream(fileStream, encryptor, CryptoStreamMode.Write)
 
 
        Dim fI As New FileInfo(fin)
        Dim lngLoopCounter As Double = 0
        lngFileLength = fI.Length
 
        Dim readStream As BinaryReader
        readStream = New BinaryReader(File.OpenRead(fin))
        Try
            Do
                'pbStatus.Value = (100 / lngFileLength) * lngLoopCounter
                lngLoopCounter = lngLoopCounter + 1
                myByte = readStream.ReadByte()
                encStream.WriteByte(myByte)
            Loop
        Catch
            encStream.FlushFinalBlock()
            encStream.Flush()
        End Try
        encStream.Close()
        fileStream.Close()
        readStream.Close()
    End Function
    Public Function DecryptFileRC2(ByVal pwd As String, ByVal fin As String, ByVal fdout As String)
        Dim fileStream As FileStream
        fileStream = File.OpenRead(fin)
        Dim salt(7) As Byte
        Try
            Dim i As Integer
            For i = 0 To 7
                salt(i) = fileStream.ReadByte()
            Next
            SetDecKey(pwd, salt)
        Catch
            fileStream.Close()
            '            Return
        End Try
        Dim encryptor As ICryptoTransform
        encryptor = clientRC2CryptoServiceProvider.CreateDecryptor()
        Dim decStream As CryptoStream
        decStream = New CryptoStream(fileStream, encryptor, CryptoStreamMode.Read)
        Dim readStream As BinaryReader
        readStream = New BinaryReader(decStream)
 
        Dim lngFileLength As Double = 0
        Dim fI As New FileInfo(fin)
        Dim lngLoopCounter As Double = 0
        lngFileLength = fI.Length
 
        Dim writeStream As BinaryWriter
        writeStream = New BinaryWriter(File.OpenWrite(fdout))
        Dim myByte As Byte
        Try
            Do
                'pbStatus.Value = (100 / lngFileLength) * lngLoopCounter
                lngLoopCounter = lngLoopCounter + 1
                myByte = readStream.ReadByte()
                writeStream.Write(myByte)
            Loop
        Catch
            writeStream.Flush()
        End Try
        writeStream.Close()
        fileStream.Close()
        readStream.Close()
    End Function
End Class