Coding membuat Alarm sederhana pada Visual Basic 2010

Ini ada coding untuk membuat alarm sederhana menggunakan Visual Basic 2010

Semoga dapat membantu sohib dalam mempelajari coding Visual Basic 2010

// PC Alarm clock by Roy Kurniawan
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
namespace PC_AlarmClock
{
   public partial class Form1 : Form
   {
      bool timeup=false;
      int duration = 0,ticks=0;
      
      public Form1()
     {
       InitializeComponent();
     }

     private void button1min_Click(object sender, EventArgs e)
    {
       duration = 60; //secs
       timer1.Start();
    }

    private void timer1_Tick(object sender, EventArgs e)
    {
       duration--;
       lblCountdown.Text = duration.ToString();
       if (duration == ticks) timeup = true;

       //To beep, call the Visual Basic library, remember to add a reference to it 
       //in the Reference section of Solution Explorer    
       if(timeup) Microsoft.VisualBasic.Interaction.Beep();
     }
     private void buttonStop_Click(object sender, EventArgs e)
     {
       timer1.Stop();
       duration = 0;
       ticks = 0;
       timeup = false;
     }

    private void button2min_Click(object sender, EventArgs e)
    {
       duration = 60*2; //secs
       timer1.Start();
    }

    private void button3min_Click(object sender, EventArgs e)
    {
       duration = 60*3; //secs
       timer1.Start();
    }

    private void button4min_Click(object sender, EventArgs e)
    {
       duration = 60*4; //secs
       timer1.Start();
    }

   private void button5min_Click(object sender, EventArgs e)
   {
      duration = 60*5; //secs
      timer1.Start();
   }

   private void button10min_Click(object sender, EventArgs e)
   {
      duration = 60*10; //secs
      timer1.Start();
   }

   private void button45_Click(object sender, EventArgs e)
   {
     duration = 60 * 45; //secs
     timer1.Start();
   }

   private void button15min_Click(object sender, EventArgs e)
   {
     duration = 60 * 15; //secs
     timer1.Start();
   }

   private void button20min_Click(object sender, EventArgs e)
   {
     duration = 60 * 20; //secs
     timer1.Start();
   }

   private void button30min_Click(object sender, EventArgs e)
   {
     duration = 60 * 30; //secs
     timer1.Start();
   }

   private void button45min_Click(object sender, EventArgs e)
   {
      duration = 60 * 45; //secs
      timer1.Start();
   }
 }
}