Cannot access a disposed object- Visual Studio Express 2010 .net GPIB Commands

I am using the 488.2 examples for VS2010. This example is the SimpleAsynchronousReadWrite template.

I can run the template fine and and I can write to my instrument without any issues. I'm trying to move the commands over to a sequence to emulate what I would normally do using the front panel of the VNA.

My Goal:

1. OPEN

2. Write *din?\n

3. String Read

4. CLOSE

Keep in mind, I simply pasted all the commands into a sequence with 500ms pauses.

4. Returns the error "Cannot access disposed object'

Private Sub sequenceButton_Click(sender As System.Object, e As System.EventArgs) Handles sequenceButton.Click

        Threading.Thread.Sleep(500)

        '******************************************
        'OPEN SESSION
        Try
            Windows.Forms.Cursor.Current = Cursors.WaitCursor
            Dim currentSecondaryAddress As Integer

            If secondaryAddressComboBox.SelectedIndex <> 0 Then
                currentSecondaryAddress = secondaryAddressComboBox.SelectedItem
            Else
                currentSecondaryAddress = 0
            End If

            GpibDevice = New Device(CInt(boardIdNumericUpDown.Value), CByte(primaryAddressNumericUpDown.Value), CByte(currentSecondaryAddress))

#If NETFX2_0 Then
            'For .NET Framework 2.0, use SynchronizeCallbacks to specify that the object 
            'marshals callbacks across threads appropriately.
            GpibDevice.SynchronizeCallbacks = True
#Else
                'For .NET Framework 1.1, set SynchronizingObject to the Windows Form to specify 
                'that the object marshals callbacks across threads appropriately.
                GpibDevice.SynchronizingObject = Me
#End If


            SetupControlState(True)
        Catch ex As Exception
            MessageBox.Show(ex.Message)
        Finally
            Windows.Forms.Cursor.Current = Cursors.Default
        End Try
        '***********************************************
        'OPEN SESSION IS DONE

        GpibDevice.Write("*idn?")

        Threading.Thread.Sleep(500)

        'READ AND PRINT TO MESSAGE BOX
        Try
            GpibDevice.BeginRead(New AsyncCallback(AddressOf OnReadComplete), Nothing)
        Catch ex As Exception
            MessageBox.Show(ex.Message)
        End Try
        'READ AND PRINT TO MESSAGE BOX - END

        Threading.Thread.Sleep(500)
        GpibDevice.Dispose()


        'CLOSE THE SESSION
        Try
            GpibDevice.Dispose()
            SetupControlState(False)
        Catch ex As Exception
            MessageBox.Show(ex.Message)
        End Try
        'CLOSE THE SESSION -END


    End Sub

 I'm pretty sure this is a syntax problem.

Thanks for any help.