C#让电脑发出声音

using System.Runtime.InteropServices;

namespace WinFormsApp1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        /// <summary>
        /// 发出嗡鸣声
        /// 引入命名空间 using System.Runtime.InteropServices;  
        /// </summary>
        /// <param name="frequency">声音频率</param>
        /// <param name="duration">声音持续时间</param>
        /// <returns></returns>
        [DllImport("Kernel32.dll")] 
        public static extern bool Beep(int frequency, int duration);


        private void button1_Click(object sender, EventArgs e)
        {
            Beep(int.Parse(txt_frequency.Text), int.Parse(txt_duration.Text));
        }
    }
}

 [DllImport("winmm.dll")]
public static extern bool PlaySound(String Filename, int Mod, int Flags);
PlaySound(@"C:\Windows\media\Windows Proximity Notification.wav", 0, 1);