C# write to textfile (implement the code in my project)

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C#

The next code displays received midi content in a console application in C#.
How do I change it that it writes the midi content instantly to a textfile (append to it)?

using System;
using Midi;
using System.Threading;
using System.Collections.Generic;

namespace MidiExamples
{    
    public class Example05 : ExampleBase
    {
        public Example05()
            : base("Example05.cs", "Prints notes and chords as they are played.")
        { }

        public class Summarizer
        {
            public Summarizer(InputDevice inputDevice)
            {
                this.inputDevice = inputDevice;
                pitchesPressed = new Dictionary<Pitch, bool>();
                inputDevice.NoteOn += new InputDevice.NoteOnHandler(this.NoteOn);
                inputDevice.NoteOff += new InputDevice.NoteOffHandler(this.NoteOff);
                PrintStatus();
            }

            private void PrintStatus()
            {
                Console.Clear();
                Console.WriteLine("Play notes and chords on the MIDI input device, and watch");
                Console.WriteLine("their names printed here.  Press any QUERTY key to quit.");
                Console.WriteLine();

                // Print the currently pressed notes.
                List<Pitch> pitches = new List<Pitch>(pitchesPressed.Keys);
                pitches.Sort();
                Console.Write("Notes: ");
                for (int i = 0; i < pitches.Count; ++i)
                {
                    Pitch pitch = pitches[i];
                    if (i > 0)
                    {
                        Console.Write(", ");
                    }
                    Console.Write("{0}", pitch.NotePreferringSharps());
                    if (pitch.NotePreferringSharps() != pitch.NotePreferringFlats())
                    {
                        Console.Write(" or {0}", pitch.NotePreferringFlats());
                    }
                }
                Console.WriteLine();
                // Print the currently held down chord.
                List<Chord> chords = Chord.FindMatchingChords(pitches);
                Console.Write("Chords: ");
                for (int i = 0; i < chords.Count; ++i)
                {
                    Chord chord = chords[i];
                    if (i > 0)
                    {
                        Console.Write(", ");
                    }
                    Console.Write("{0}", chord);
                }
                Console.WriteLine(); 
            }

            public void NoteOn(NoteOnMessage msg)
            {
                lock (this)
                {
                    pitchesPressed[msg.Pitch] = true;
                    PrintStatus();
                }
            }

            public void NoteOff(NoteOffMessage msg)
            {
                lock (this)
                {
                    pitchesPressed.Remove(msg.Pitch);
                    PrintStatus();
                }
            }

            private InputDevice inputDevice;
            private Dictionary<Pitch, bool> pitchesPressed;
        }

        public override void Run()
        {
            // Prompt user to choose an input device (or if there is only one, use that one).
            InputDevice inputDevice = ExampleUtil.ChooseInputDeviceFromConsole();
            if (inputDevice == null)
            {
                Console.WriteLine("No input devices, so can't run this example.");
                ExampleUtil.PressAnyKeyToContinue();
                return;
            }
            inputDevice.Open();
            inputDevice.StartReceiving(null);

            Summarizer summarizer = new Summarizer(inputDevice);
            ExampleUtil.PressAnyKeyToContinue();
            inputDevice.StopReceiving();
            inputDevice.Close();
            inputDevice.RemoveAllEventHandlers();
        }
    }
}