Resume thread after stopping using ManualResetEvent

Question

I'm trying to use ManualResetEvent to start, pause, resume and terminate thread by referring to Stopping a Thread, ManualResetEvent, volatile boolean or cancellationToken . I'm confused with Set() and WaitOne(). Here's my code and I will need some help for the changes that have to be made so that I can resume after pausing the thread and stop entirely then I can start again the work without closing the whole winform.

namespace ThreadForm
{
    public partial class Form1 : Form
    {
        public static volatile bool isPausePressed = false;
        private static EventWaitHandle waitHandle = new ManualResetEvent(initialState: true);
        Thread SequenceTest = new Thread(DoWork);
        Thread Seq1Test = new Thread(TestSequence1);
        Thread Seq2Test = new Thread(TestSequence2);
        Thread Seq3Test = new Thread(TestSequence3);
        

        public Form1()
        {
            InitializeComponent();
        }
        Form2 objform;

        private void button1_Click(object sender, EventArgs e)
        {
            objform = new Form2();
            objform.Show();
            var formWithButton = new Form2();
            formWithButton.Btn_Change.BackColor = Color.White;
            if (SequenceTest.IsAlive)
            {
                waitHandle.Set();
            }
            else
            {
                SequenceTest.Start();
                Seq1Test.Start();
                Seq2Test.Start();
                Seq3Test.Start();
            }
            
        }

        private void button2_Click(object sender, EventArgs e)
        {
            isPausePressed = true;
        }

        private void button3_Click(object sender, EventArgs e)
        {
            waitHandle.Reset();
            MessageBox.Show("Done!", "ThreadTest");
        }

        public static void DoWork()
        {
            Thread.Sleep(1000);
            //Console.WriteLine("Current main task working on thread: {0}", Thread.CurrentThread.ManagedThreadId);
            while (!isPausePressed)
            {
                Thread.Sleep(100);
            }
        }

        public static void TestSequence1()
        {
            int i = 0;
            Thread.Sleep(1000);
            //Console.WriteLine("Sequence1 working on thread: {0}", Thread.CurrentThread.ManagedThreadId);
            while (i!=10)
            {
                i++;
                //Console.WriteLine("Current i value: {0}", i);
            }
            isPausePressed = true;
        }

        public static void TestSequence2()
        {
            int j = 0;
            //Console.WriteLine("Sequence2 working on thread: {0}", Thread.CurrentThread.ManagedThreadId);
            Thread.Sleep(1000);
            while (j != 10)
            {
                j++;
                //Console.WriteLine("Current j value: {0}", j);
            }
        }

        public static void TestSequence3()
        {
            int k = 0;
            Thread.Sleep(1000);
            //Console.WriteLine("Sequence3 working on thread: {0}", Thread.CurrentThread.ManagedThreadId);
            while (k != 10)
            {
                k++;
                //Console.WriteLine("Current k value: {0}", k);
            }
        }
    }
}