What should be better way to minimize CPU load its going upto 70 to 80%.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.Runtime.CompilerServices;

namespace ConsoleApplication1
{
    class Program
    {
        
        static System.Threading.Thread sender;
        static DataSender dataSender;
       
        static void Main(string[] args)
        {            
            dataSender = new DataSender();
            var dataSender2 = new DataSender();
            var dataSender3 = new DataSender();
            var dataSender4 = new DataSender();

            sender = new System.Threading.Thread(dataSender.StartSending2);
            sender.IsBackground = true;
            sender.Start();

            sender = new System.Threading.Thread(dataSender2.StartSending2);
            sender.IsBackground = true;
            sender.Start();

            sender = new System.Threading.Thread(dataSender3.StartSending2);
            sender.IsBackground = true;
            sender.Start();

            Console.ReadKey();
        }       
    }

    class SnderEvrgs : EventArgs
    {
        public SnderEvrgs()
        {
        }
    }

    class DataSender
    {
        private static string IP = "127.0.0.1";
        public static int Port = 20100;
        static bool issending = true; 
        public static event EventHandler<SnderEvrgs> DataSent;

        public void StartSending1()
        {
            while (issending)
            {
                System.Net.Sockets.UdpClient _sockMain = new System.Net.Sockets.UdpClient(IP, Port);
                byte[] arr_bData = new byte[] { 1, 1, 1, 1, 1 };
                Console.WriteLine(DateTime.Now);

                for (int i = 0; i < 100000000; i++)
                {
                }                            
            }
        }

        static AutoResetEvent abc = new AutoResetEvent(false);
        Thread newthread;
        
        public void StartSending2()
        {
            while (issending)
            {
                newthread = new Thread(sendData);
                newthread.IsBackground = true;
                newthread.Priority = ThreadPriority.Lowest;
                newthread.Start();
                abc.WaitOne();
            }
        }

        object abca = new object();

        [MethodImplAttribute(MethodImplOptions.Synchronized)]
        public void sendData()
        {
            lock (abca)
            {
                System.Net.Sockets.UdpClient _sockMain = new System.Net.Sockets.UdpClient(IP, Port);
                byte[] arr_bData = new byte[] { 1, 1, 1, 1, 1 };
                Console.WriteLine(DateTime.Now);
                if (_sockMain.Send(arr_bData, arr_bData.Length) == arr_bData.Length) ;
                {
                    for (int i = 0; i < 1000000000; i++)
                    {
                    }

                    abc.Set();
                }
            }
        }
    }
}