Threading concept in C#

Question

I am new to C# and still learning the threading concept. I wrote a program which is as follows

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Threading;

namespace ConsoleApplication17
{
  class Program
  {
    static void Main(string[] args)
    {
        System.Threading.ThreadStart th1 = new System.Threading.ThreadStart(prnt);
        Thread th = new Thread(th1);
        th.Start();
        bool t = th.IsAlive;
        for (int i = 0; i < 10; i++)
        {
            Console.WriteLine(i + "A");
        }
    }

    private static void prnt()
    {
        for (int i = 0; i < 10; i ++)
        {
            Console.WriteLine(i + "B");
        }
    }
  }
}

I am expecting an output like :-

1A
2A
1B
3A
2B...

as I believe that both main thread and newly created thread should be executing simultaneously.

But the output is ordered , first the prnt function is called and then the Main method for loop is executed.

Answer 1

maybe a cicle of 10 is not enough to see the two thread running at same time. use a longer loop or put a Thread.Sleep (100) within cycle iteration. Starting a thread is quite expensive. What it happens, probably, is that you Main loop get executed before thread loop start, due to the time required for a thread to start

Answer 2

I agree with previous answers you need to add Thread.Sleep(some seconds * 1000)

I recommend you read this article about thread https://msdn.microsoft.com/ru-ru/library/system.threading.thread(v=vs.110).aspx

    static void Main(string[] args)
    {
        Thread th = new Thread(prnt);
        th.Start();
        for (int i = 0; i < 10; i++)
        {
            //sleep one second
            Thread.Sleep(1000);
            Console.WriteLine(i + "A");
        }
        //join the basic thread and 'th' thread 
        th.Join();
    }
    private static void prnt()
    {
        for (int i = 0; i < 10; i++)
        {
            //sleep one second
            Thread.Sleep(1000);
            Console.WriteLine(i + "B");
        }
    }