using System;

using System.Threading;                 

public class Program

{

    public static void Main()

    {

        Thread tr=new Thread(PrintTriangle);

        tr.Name="Pankaj this is back ground threading";

        tr.Start();

        tr.IsBackground=true;

        Console.WriteLine("Hello {0}",tr.Name);

    }

    static void PrintTriangle()

    {

        for(int i=10 ;i>=1;i--)

        {

            for(int j=9;j>=1;j--)

            {

                Console.Write(" ");

            }

            for(int k=1;k<i-1; k++)

            {

                Console.Write(k);

            }

            for(int l=i-1;l>=1;l--)

            {

                Console.Write(l);

            }

            Console.WriteLine();

        }

         Thread.Sleep(400);

    }

}