C# thread , start, pause, continue, terminate, main thread wait

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C#

Form have 4 button and a lable

form freezes because of

_thread.Join();

when I click btnStart.
I do not know anything about threading . I wrote this code by seeing some samples.
i need somthing like this to do , start, pause, continue, terminate, main thread wait.
thank you in advance for any idea.

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;
using System.Threading;

namespace test_threading
{
    public partial class Form1 : Form
    {
        public Thread _thread ;
        private static ManualResetEvent _mre = new ManualResetEvent(false);
        public bool _canceled = false;

        public Form1()
        {
            InitializeComponent();
        }

        
        private void btnStart_Click(object sender, EventArgs e)
        {
            btnStart.Enabled = false; btnPause.Enabled = true; 
            btnContinue.Enabled = false; btnTerminate.Enabled = true;
            _canceled = false;
            _thread = new Thread(DoWork);
            _thread.Start();
            _mre.Set();

            _thread.Join();
            label1.Text = "thread joined";
            btnStart.Enabled = true; btnPause.Enabled = false;
            btnContinue.Enabled = false; btnTerminate.Enabled = false;
        }

        private void btnPause_Click(object sender, EventArgs e)
        {
            btnPause.Enabled = false; btnContinue.Enabled = true;
            _mre.Reset();
        }

        private void btnContinue_Click(object sender, EventArgs e)
        {
            btnContinue.Enabled = false; btnPause.Enabled = true; 
            _mre.Set();
        }

        private void btnTerminate_Click(object sender, EventArgs e)
        {
            try
            {
                _thread.Abort();
                _canceled = true;
                btnStart.Enabled = true; btnPause.Enabled = false;
                btnContinue.Enabled = false; btnTerminate.Enabled = false;
            }
            catch(Exception ex)
            { MessageBox.Show("btnTerminate_Click\n" + ex.Message); } 
           
        }
        private void DoWork()
        {
            try 
            {
                for (int cnt = 0; cnt<10000; cnt++)
                {
                    _mre.WaitOne();
                    Count("label1", cnt);
                }
            }
            catch (Exception ex) 
            {
                if (ex.Message!="Thread was being aborted.")
                { MessageBox.Show("DoWork\n" + ex.Message);} 
            }
           
        }
        private delegate void Dstrint(string _controlName, int _cnt);
        public void Count(string _controlName, int _cnt)
        {
            if (Controls[_controlName].InvokeRequired)
            {
                Dstrint h = new Dstrint(Count);
                this.Invoke(h, new object[] { _controlName, _cnt });
            }
            else
            {
                Controls[_controlName].Text = _cnt.ToString();
            }
        }
    }
}