C# Background vs Foreground Threads, C#

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//Rextester.Program.Main is the entry point for your code. Don't change it.
//Compiler version 4.0.30319.17929 for Microsoft (R) .NET Framework 4.5

using System;
using System.Threading;

namespace Rextester
{
    public class Program
    {
        public static void Main(string[] args)
        {
            Thread waterThread = new Thread(new ThreadStart(WaterSoundMethod));
            waterThread.IsBackground = true;

Thread beeThread = new Thread(new ThreadStart(BeeSoundMethod));
            beeThread.IsBackground = true;

waterThread.Start();
            Console.WriteLine("The thread's background status is: "+waterThread.IsBackground.ToString());
            beeThread.Start();
            Console.WriteLine("The thread's background status is: "+beeThread.IsBackground.ToString());
            
            Thread.Sleep(20);
            Console.WriteLine("Enjoying the nature");
            waterThread.Interrupt();
            waterThread.Join();
        }
        
        static void WaterSoundMethod()
        {
            try{
            while(true)
            {
                Console.WriteLine("Ffffffffff!");
                Thread.Sleep(10);
            }
            }
            catch(ThreadInterruptedException exception){
                Console.WriteLine(exception);
            }
        }
        
        static void BeeSoundMethod()
        {
            while(true)
            {
                Console.WriteLine("Buzzzzzzz!");
                Thread.Sleep(10);
            }
        }
    }
}

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Compilation time: 0,14 sec, absolute running time: 0,14 sec, cpu time: 0,08 sec, average memory usage: 16 Mb, average nr of threads: 4