C#

using System;
using System.IO.Ports;

namespace SerialPortUsbCrash {
class Program {
    static void Main(string[] args) {
     SerialPort serialPort = null;
     serialPort = new SerialPort("COM12", 19200, Parity.None, 8, 
StopBits.One);
     serialPort.Open();
     Console.Write("Pull out the USB cable, and push return");
     Console.ReadLine();
     try {
        serialPort.Close();
     } catch (Exception ex) {
        Console.WriteLine("Got exception closing SerialPort: " + ex);
     }
     Console.WriteLine("- THE END -");
     Console.ReadLine();
    }
}

namespace WpfApplication2
{
    public partial class Window1 : Window
    {
        public Window1()
        {
            InitializeComponent();
            DateTime current = DateTime.Now;
            Entrance();
        }

        private void Entrance()
        {
            selectedDate.Text = DateTime.Now.ToString("MM/dd/yyyy");
        }

        private void displayEvents_Click(object sender, RoutedEventArgs e)
        {
            try
            {
                DateTime selected = DateTime.Parse(enteredDate.Text);
                selectedDate.Text = selected.ToString("MM/dd/yyyy");
            }
            catch (FormatException)
            {
                MessageBox.Show("The date you enterd was invalid.\n\nPlease reenter the date in
 the format MM/dd/yyyy.");
            }
        }

        private void saveNewEvent_Click(object sender, RoutedEventArgs e)
        {
            try
            {
                WriteToFile();
                WriteToEventList();
            }
            catch (FormatException)
            {
                MessageBox.Show("The date you enterd was invalid.\n\nPlease reenter the date in the format MM/dd/yyyy.");
            }
        }

        private void WriteToFile()
        {
            DateTime newEntry = DateTime.Parse(newDate.Text);
            string addEvent = "";
            addEvent = newEvent.Text;
            using (TextWriter writeEvent = new StreamWriter("datebook.txt"))
            {
                writeEvent.WriteLine(newEntry.ToString());
                writeEvent.WriteLine(addEvent); 
            }
        }

        private void WriteToEventList()
        {
            DateTime newEntry = DateTime.Parse(newDate.Text);
            string addEvent = "";
            addEvent = newEvent.Text;
            eventsList.AppendText(String.Format("{0}\t{1}\n", newEntry, addEvent));
        }
    }
}