Thread

 
using System;
using System.Threading;


class ThreadTest
{
    static void Main()
    {
        Thread t = new Thread(WriteY);  // Kick off a new thread 
        t.Start();  // running WriteY()

        // Simultaneously, do something on the main thread. 
        for (int i = 0; i < 10; i++) 
            Console.Write ("x");
    }

    static void WriteY()
    {
        for (int i = 0; i < 10; i++) 
            Console.Write("y");
    }
}