Windows Forms: Multi Threading in C#

The advantage of threading is the ability to create applications that use more than one thread of execution. For example, a process can have a user interface thread that manages interactions with the user and worker threads that perform other tasks while the user interface thread waits for user input.

Step 1: Click New Project, then select Visual C# on the left, then Windows and then select Windows Forms Application. Name your project "MultiThread" 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;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace MultiThread
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void btnThread1_Click(object sender, EventArgs e)
        {
            //Start new thread
            Thread thread = new Thread(t =>
              {
                  for(int i = 0; i < 100; i++)
                  {
                      int width = rd.Next(0, this.Width);
                      int height = rd.Next(50, this.Height);
                      this.CreateGraphics().DrawEllipse(new Pen(Brushes.Red, 1), new Rectangle(width, height, 10, 10));
                      //Delay
                      Thread.Sleep(100);
                  }
              })
            { IsBackground = true };
            thread.Start();
        }

        Random rd;

        private void Form1_Load(object sender, EventArgs e)
        {
            rd = new Random();
        }

        private void btnThread2_Click(object sender, EventArgs e)
        {
            //Start new thread
            Thread thread = new Thread(t =>
            {
                for (int i = 0; i < 100; i++)
                {
                    int width = rd.Next(0, this.Width);
                    int height = rd.Next(50, this.Height);
                    this.CreateGraphics().DrawEllipse(new Pen(Brushes.Blue, 1), new Rectangle(width, height, 10, 10));
                    //Delay
                    Thread.Sleep(100);
                }
            })
            { IsBackground = true };
            thread.Start();
        }
    }
}

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