using System.IO.Ports; SerialPort port = new SerialPort(); port.PortName = "COM1"; port.BaudRate = 9600; port.Parity = Parity.None; port.DataBits = 8; port.StopBits = StopBits.One; port.Open();This code snippet creates a new SerialPort object, sets its properties, and then opens the port. Package library used: System.IO.Ports.