InterLocked synchronisation with Multithreading

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 InterlockedClassDemo
{
 public partial class Form1 : Form
 {
 int Number = 0;
 public Form1()
  {
   InitializeComponent();
  }
 private void button1_Click(object sender, EventArgs e)
  {

  Number =0;                                                      //whenever a button is clicked the Number is reassigned to 0
           
 int totalThread = 10000;                                         //the number of threads thats need to be created is 10000
            Thread[] interLockedThread = new Thread[totalThread];            // Array of types Thread is created
            for (int i = 0; i < totalThread; i++)                            // Declared For Loop to creat 10000 thread for performing the increment operation
            {
                interLockedThread[i] = new Thread(new ThreadStart(UpdateValue)); //parameterised threads are created and listbox is updated
                interLockedThread[i].IsBackground = true;                        // Threads is moved to background
                interLockedThread[i].Priority = ThreadPriority.Lowest;           //priority is set to low
                interLockedThread[i].Start();                                    //started the execution of the thread

            }

            for (int i = 0; i < totalThread; i++)
            {
                interLockedThread[i].Join();                                    // Main thread is stopped till the completion of all Threads
            }

            label5.Text = Number.ToString();

        }

        private void UpdateValue()
        {
          
            listBox1.BeginInvoke(new ParameterizedThreadStart(updateListBox1), "ThreadID ::" + Thread.CurrentThread.ManagedThreadId + "-B=" + Number.ToString());
            Number ++;
            listBox1.BeginInvoke(new ParameterizedThreadStart(updateListBox1), "ThreadID ::" + Thread.CurrentThread.ManagedThreadId + "-A=" + Number.ToString());
        }

        public void updateListBox1(object objrslt)
        {
            listBox1.Items.Add(objrslt.ToString());
        }

        private void button2_Click(object sender, EventArgs e)
        {
            Number = 0;                                                      //whenever a button is clicked the Number is reassigned to 0
            int totalThread = 10000;                                         //the number of threads thats need to be created is 10000
            Thread[] interLockedThread = new Thread[totalThread];            // Array of types Thread is created
            for (int i = 0; i < totalThread; i++)                            // Declared For Loop to creat 10000 thread for performing the increment operation
            {
                interLockedThread[i] = new Thread(new ThreadStart(UpdateValueInterlock)); //parameterised threads are created and listbox is updated
                interLockedThread[i].IsBackground = true;                        // Threads is moved to background
                interLockedThread[i].Priority = ThreadPriority.Lowest;           //priority is set to low
                interLockedThread[i].Start();                                    //started the execution of the thread

            }

            for (int i = 0; i < totalThread; i++)
            {
                interLockedThread[i].Join();                                    // Main thread is stopped till the completion of all Threads
            }

            label6.Text = Number.ToString();                                    //At the out putLabel the number is displayed
        }

        private void UpdateValueInterlock()
        {
            listBox2.BeginInvoke(new ParameterizedThreadStart(updateListBox2), "ThreadID ::" + Thread.CurrentThread.ManagedThreadId + "-B=" + Number.ToString());   //Using delegate method to start the thread
            Interlocked.Increment(ref Number);                                                                                                                      //Increment the nuber by interlocked method
            listBox2.BeginInvoke(new ParameterizedThreadStart(updateListBox2), "ThreadID ::" + Thread.CurrentThread.ManagedThreadId + "-A=" + Number.ToString());   //Using delegate method to start the thread
        }
        public void updateListBox2(object objrslt)
        {
            listBox2.Items.Add(objrslt.ToString());                           //Update ing item in the list box
        }

    }
}