How to create a pool of threads

using System;
using System.Threading;

class Program {
    static void Main(string[] args) {
        var sync = new ManualResetEvent(false);
        ThreadPool.QueueUserWorkItem((_) => {
            Console.WriteLine("Running");
            Thread.CurrentThread.IsBackground = false;
            sync.Set();
            Thread.Sleep(5000);
            Console.WriteLine("Done, should exit now");
            Thread.Sleep(250);
        });
        sync.WaitOne();  // Ensures IsBackground is set
    }
}

class MyClass{
 static void myMethod(){
   // some task
 }
}

Runnable runnable = () ->{
  for(int i=0; i<10; i++){
   try{
     Thread.sleep(1000);
     MyClass.myMethod();
   }catch{}
  }
};

int threadCount = 10; //whatever number of threads you wish
ExecutorService executor = Executors.newFixedThreadPool(threadCount);

executor.execute(runnable);