PrecisionTimer - VB.NET

'------------------
'Creator: aeonhack
'Site: elitevs.net
'Created: 11/30/2011
'Changed: 11/30/2011
'Version: 1.0.0
'------------------
Class PrecisionTimer
    Implements IDisposable

    Private _Enabled As Boolean
    ReadOnly Property Enabled() As Boolean
        Get
            Return _Enabled
        End Get
    End Property

    Private Handle As IntPtr
    Private TimerCallback As TimerDelegate

    <DllImport("kernel32.dll", EntryPoint:="CreateTimerQueueTimer")> _
    Private Shared Function CreateTimerQueueTimer( _
    ByRef handle As IntPtr, _
    ByVal queue As IntPtr, _
    ByVal callback As TimerDelegate, _
    ByVal state As IntPtr, _
    ByVal dueTime As UInteger, _
    ByVal period As UInteger, _
    ByVal flags As UInteger) As Boolean
    End Function

    <DllImport("kernel32.dll", EntryPoint:="DeleteTimerQueueTimer")> _
    Private Shared Function DeleteTimerQueueTimer( _
    ByVal queue As IntPtr, _
    ByVal handle As IntPtr, _
    ByVal callback As IntPtr) As Boolean
    End Function

    Delegate Sub TimerDelegate(ByVal reserve As IntPtr, ByVal reserve As Boolean)

    Sub Create(ByVal dueTime As UInteger, ByVal period As UInteger, ByVal callback As TimerDelegate)
        If _Enabled Then Return

        TimerCallback = callback
        Dim Success As Boolean = CreateTimerQueueTimer(Handle, IntPtr.Zero, TimerCallback, IntPtr.Zero, dueTime, period, 0)

        If Not Success Then ThrowNewException("CreateTimerQueueTimer")
        _Enabled = Success
    End Sub

    Sub Delete()
        If Not _Enabled Then Return
        Dim Success As Boolean = DeleteTimerQueueTimer(IntPtr.Zero, Handle, IntPtr.Zero)

        If Not Success AndAlso Not Marshal.GetLastWin32Error = 997 Then
            ThrowNewException("DeleteTimerQueueTimer")
        End If

        _Enabled = Not Success
    End Sub

    Private Sub ThrowNewException(ByVal name As String)
        Throw New Exception(String.Format("{0} failed. Win32Error: {1}", name, Marshal.GetLastWin32Error))
    End Sub

    Private Sub Dispose() Implements IDisposable.Dispose
        Delete()
    End Sub
End Class