Using available com ports from listbox

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What im trying to do its after i put available com ports into listbox1, then when an user select a com port from it, make an assignment from selected value in listbox to PortName

.PortName = ListBox1.SelectedItem.Value

but this seems doesnt work. What im doing wrong? THanks

What I have tried:

Public Class Com
    Private Sub ListBox1_SelectedIndexChanged(sender As Object, e As EventArgs) Handles ListBox1.SelectedIndexChanged
        With Form1.SerialPort1
            .BaudRate = 9600    'for example, set the speed as you actually need it
            .Parity = System.IO.Ports.Parity.Space    'much more common would be .None
            .StopBits = 1          'or 2, though 2 should not normally be used (IMO)
            .PortName = ListBox1.SelectedItem.Value 'for example
            .Handshake = System.IO.Ports.Handshake.RequestToSend  'or .None
            .RtsEnable = True
            .Open()

        End With
    End Sub
End Class

Posted 27-Jun-17 22:38pm

JeezyWonder

Updated 28-Jun-17 2:07am

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F. Xaver 28-Jun-17 5:09am

use the debuger to watch what is getting set..
what have you used to fill the listbox? (listbox1 is allways a terrible name btw)
System.IO.Ports.SerialPort.GetPortNames to get the actual present devices?

from a fast look it should work fine.. but if you not block the listbox after that, or close and freeing the comport befor a new selection you will pretty sure get errors.
(and as your comments say.. some of those settings are kinda uncommon. I've never seen a device with .Parity = Space so far

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KarstenK · Answer 1 · 2017-06-28T02:07:00

For cleaner code you better create a new port object when opening. Because it is a system resource you must handle it carefully, so close it after end of usage every time. Else the port may be blocked til next reboot. Separate UI-code from communication code to avoid messy code.

Read the article and code of SerialPort Sample in VB.NET (C#).