Chris May

Encoding.ASCII.GetString(bytes)

And here is a function for that uses it to convert a byte array to a string

    
    Private Function streamToString(ByVal stream As System.IO.MemoryStream) As String
        Dim o As New IO.StreamWriter(stream, System.Text.Encoding.Default)
        Dim bytes(stream.Length - 1) As Byte
        stream.Read(bytes, 0, stream.Length - 1)
        Return Encoding.ASCII.GetString(bytes)
    End Function

Here is the ever elusive, and poorly documented User schema for AD.

UPDATE: It seem they took away the page above.  Here is a new one.  First pick a type of object, for example User, then pick the property you want, like Surname.  Finally look for the LDAP Display Name, and it will show you the property name, e.g. "sn".