Step 1: Click New Project, then select Visual C# on the left, then Windows and then select Windows Forms Application. Name your project "AlarmClock" and then click OK
Step 2: Design your form as below

Step 3: Add code to button click event handler as below
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace AlarmClock
{
public partial class Form1 : Form
{
System.Timers.Timer timer;
public Form1()
{
InitializeComponent();
}
private void Form1_Load(object sender, EventArgs e)
{
timer = new System.Timers.Timer();
timer.Interval = 1000;
timer.Elapsed += Timer_Elapsed;
}
private void Timer_Elapsed(object sender, System.Timers.ElapsedEventArgs e)
{
DateTime currentTime = DateTime.Now;
DateTime userTime = dateTimePicker.Value;
if (currentTime.Hour == userTime.Hour && currentTime.Minute == userTime.Minute && currentTime.Second == userTime.Second)
{
timer.Stop();
UpdateLable upd = UpdateDataLable;
//Update label control in mutiple thread
if (lblStatus.InvokeRequired)
Invoke(upd, lblStatus, "Stop");
MessageBox.Show("Ring ring ring...", "Message", MessageBoxButtons.OK, MessageBoxIcon.Information);
}
}
//Update label control
delegate void UpdateLable(Label lbl, string value);
void UpdateDataLable(Label lbl,string value)
{
lbl.Text = value;
}
private void btnStart_Click(object sender, EventArgs e)
{
timer.Start();
lblStatus.Text = "Running...";
}
private void btnStop_Click(object sender, EventArgs e)
{
timer.Stop();
lblStatus.Text = "Stop";
}
}
}
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