serial port multi thread issue

I have a serial port app that works on a laptop but seems to freeze on the pocketpc. The incoming communication is a constant stream at 9600 baud and it looks like the "comport data received" function doesn't quit even though it is called using "me.invoke".

So my question is, why does this work on the laptop and not on the Dell Axim x51

Here is the code:

Public Class Form1

Public comport As New SerialPort()

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

Try

AddHandler comport.DataReceived, AddressOf OnSerialDataReceived

comport.DataBits = 8

comport.StopBits = StopBits.One

comport.Parity = Parity.Odd

comport.BaudRate = 9600

comport.PortName = "Com1"

comport.Open()

comport.DtrEnable = True

comport.RtsEnable = True

comport.DiscardNull = True

If comport.IsOpen = True Then

Button1.BackColor = System.Drawing.Color.Green

Else

Button1.BackColor = System.Drawing.Color.Red

End If

Catch ex As Exception

MsgBox(ex.Message.ToString)

End Try

End Sub

Private Sub OnSerialDataReceived(ByVal sender As Object,

ByVal args As SerialDataReceivedEventArgs)

Try

Me.Invoke(New EventHandler(AddressOf ReceiveSerialData))

Catch ex As Exception

End Try

End Sub

Sub ReceiveSerialData(ByVal s As Object, ByVal e As EventArgs)

Try

txtReceive.Text = comport.ReadTo("H")

Catch ex As Exception

Label2.Text = ex.Message.ToString

End Try

End Sub

Private Sub Send_Text()

Try

comport.WriteLine(txtSend.Text)

txtSend.Text = ""

Catch ex As Exception

Label2.Text = ex.Message.ToString()

End Try

End Sub