RESOLVED: Tutorials for Serial ports / threading???

[Og_ofthejungle]

I'm looking for any tutorials on serial ports. I'm working on a project to read a serial port, and this is my current method:

SerialPort1.Close()
        SerialPort1.BaudRate = 9600
        SerialPort1.Parity = IO.Ports.Parity.None
        SerialPort1.DataBits = 8
        SerialPort1.StopBits = IO.Ports.StopBits.One
        SerialPort1.Open()
        SerialPort1.ReadExisting()
        Dim input As String = _SerialPort1.ReadExisting
        TextBox1.Text = input
        TextBox1.Refresh()

I get no build errors or other errors, but on running it, I get no text in textbox1.

I do have a serial port control on form1.

To test, I have connected two computers and sent serial data from hyperterminal to hyperterminal successfully. This also confirms that baud/parity/stop/data are set correctly.

Clearly, there's something missing, but the books I have don't talk about serial, so I'm hoping that there is a tutorial out there somewhere than makes it clear as mud.

I'd also love to see a tutorial on threading in VB.net, if anyone has one lying around.

Thanks in advance.