How to use Thread Pool

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C#

ASP.NET

Hi
When i run this code then nothing display on console but when i debug then it display the output.
Please explain why this happen? How i can get info when the Thread complete the task ?

public class TestClass
 {
     static void Main()
     {
         ThreadPool.SetMaxThreads(5, 5);
         for (int x = 0; x < 10; x++)
         {
             ThreadPool.QueueUserWorkItem(new WaitCallback(printnum), x);
         }

         Console.ReadKey();
     }

     public static void printnum(object n)
     {
         Console.WriteLine("Call " + n);
         for (int i = 0; i < 10; i++) { Console.WriteLine(i); }
     }
 }