How to solve problems with NAudio?

Question

C++ / C#

Hello.
There is such task: It is
necessary to implement the program. The program has a text field and the ability to open text files and paste text from the file into this text field.
Also, the program should record audio. For this I use the NAudio library.
Pressing CTRL+1 plays the audio. When you press CTRL+2, stop playback.
Each file is recorded by record number. The number is incremented after each entry.
I implemented the program correctly, I took the code from NAudio from an article about recording audio in C # through NAudio. There was a recording code immediately in the button event, but I implemented separate methods.
As a result, Visual Studio produces a list of errors.
Please help me figure it out.
Form file code:

using System;
using System.Runtime.InteropServices;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.IO;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using NAudio;
using NAudio.CoreAudioApi;
using NAudio.FileFormats;
using NAudio.Wave;

namespace RecordBooks
{
    public partial class Form1 : Form
    {
        WaveIn waveIn;
        WaveFileWriter writer;
        string recordFile = "";
        int numberRecords = 0;
        public Form1()
        {
            InitializeComponent();
            KeyPreview = true;
            KeyDown += Form1_KeyDown;
        }

        private void Form1_KeyDown(object sender, KeyEventArgs e)
        {
            if (e.Control && e.KeyCode == Keys.D1)
            {
                StartRecording();
            }
            else if (e.Control && e.KeyCode == Keys.D2)
            {
                if (waveIn != null)
                {
                    StopRecording();
                }
            }
        }

        void waveIn_DataAvailable(object sender, WaveInEventArgs e)
        {
            if (this.InvokeRequired)
            {
                this.BeginInvoke(new EventHandler<WaveInEventArgs>(waveIn_DataAvailable), sender, e);
            }
            else
            {
                writer.WriteData(e.Buffer, 0, e.BytesRecorded);
            }
        }

        void StartRecording()
        {
            recordFile = Convert.ToString(numberRecords) + ".wav";
            try
            {
                waveIn = new WaveIn();
                waveIn.DeviceNumber = 0;
                waveIn.DataAvailable += waveIn_DataAvailable;
                waveIn.RecordingStopped += new EventHandler(waveIn_RecordingStopped);
                waveIn.WaveFormat = new WaveFormat(8000, 1);
                writer = new WaveFileWriter(recordFile, waveIn.WaveFormat);
                waveIn.StartRecording();
            }
            catch (Exception ex)
            { MessageBox.Show(ex.Message); }
        }

        void StopRecording()
        {
            waveIn.StopRecording();
            numberRecords += 1;
        }

        private void waveIn_RecordingStopped(object sender, EventArgs e)
        {
            if (this.InvokeRequired)
            {
                this.BeginInvoke(new EventHandler(waveIn_RecordingStopped), sender, e);
            }
            else
            {
                waveIn.Dispose();
                waveIn = null;
                writer.Close();
                writer = null;
            }
        }

        void menuNew_Click(object sender, EventArgs e)
        {
            richTextBox1.Clear();
            numberRecords = 0;
        }

        void menuExit_Click(object sender, EventArgs e)
        {
            Application.Exit();
        }

        void menuOpen_Click(object sender, EventArgs e)
        {
            if (openFileDialog1.ShowDialog() == DialogResult.OK && openFileDialog1.FileName.Length > 0)
            {
                richTextBox1.LoadFile(openFileDialog1.FileName, RichTextBoxStreamType.PlainText);
                numberRecords = 0;
            }
        }

        void menuSave_Click(object sender, EventArgs e)
        {
            if (saveFileDialog1.ShowDialog() == DialogResult.OK)
            {
                richTextBox1.SaveFile(saveFileDialog1.FileName, RichTextBoxStreamType.PlainText);
            }
        }
    }
}

TypeErrors :
Error CS0029 Cannot implicitly convert type 'System.EventHandler' to 'System.EventHandler' RecordBooks Thanks
in advance for your help!