Help for serial port programming in vb.net

[yvqn9945]

I want to write a vb.net program for serial communication which consists of Tx window Rx window connect and disconnect buttons. When I press connect if the COM port is unplugged then it must give a message in msgbox – COM port is unplugged please plug it and try again. How to write code for this please any one give a sample code.

 

[ZeDingo]

In .NET you can access serial ports through System.IO.Ports: SerialPort
A less complex example, showing how to receive a string: https://msdn.microsoft.com/en-us/library/7ya7y41k.aspx
The constructor will throw System.IO.IOException if the COM port doesn't exist or cannot be opened. I don't know if "cannot be opened" means that no device is connected, or if another app has control of the port.

I'd help more but all my COM ports are virtual.