Multithreading

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MultiThreadingController.cs
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using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using System.Threading

public class MultiThreadingController : Controller
{
    List retList = new List();

    public ActionResult MultiThreading()
    {
      ThreadStart Thread1 = new ThreadStart(ThreadCall1);
      Thread child1 = new Thread(Thread1);

      retList.Add(" Into MultiThreading ActionResult");
      retList.Add(" thread1 started");
      child1.Start();

      ThreadStart Thread2 = new ThreadStart(ThreadCall2);
      Thread child2 = new Thread(Thread2);

      retList.Add(" thread2 started");
      child2.Start();

      retList.Add(" Main sleeping for 2 seconds ");
      Thread.Sleep(2000);

      child1.Abort();
      retList.Add("  thread1 aborted ");

      child2.Abort();
      retList.Add("  thread2 aborted ");

      ViewBag.retList = retList;
      return View();
    }

    public void ThreadCall1()
    {
      retList.Add("--");
      retList.Add(" Into thread1");

      for (int i = 0; i < 5; i++)
      {
        retList.Add("  thread1 " + i.ToString());
      }

      retList.Add("After thread1 count");

    }

    public void ThreadCall2()
    {
      retList.Add("--");
      retList.Add(" Into thread2");

      for (int i = 0; i < 5; i++)
      {
        retList.Add("  thread2 " + i.ToString());
      }

      retList.Add("After thread2 count");
      retList.Add("--");

    }
}

    -------------------------------------------------------------------------
    MultiThreading.cshtml
    -------------------------------------------------------------------------
    @{
    ViewBag.Title = "Multithreading";
    Layout = "~/Views/Shared/_Layout.cshtml";
    }

    <div class="row col-sm-12 text-center">
    <h4 style="color:red;">(click on heading for code snippets)</h4>
    </div>

    <div class="row col-sm-12" id="dvMultithreading" data-toggle="modal" data-target="#modalMultithreading">
    <center>
    <h1>Multithreading</h1>
    </center>
    </div>

    <div class="col-sm-12 row" style="height:10px;"> </div>

    <div class="row col-sm-12">
    <div class="col-sm-4"></div>
    <div class="col-sm-4" style="border:2px solid blue; font-size:large; font-weight:bold;">
    <center>
    @if (ViewBag.retList != null)
    {
    foreach (var item in ViewBag.retList)
    {
    <div class="row" style="padding-left:25px;">
    @item
    </div>
    }
    }
    else
    {
    <div class=" col-sm-12" style="height:120px; border:2px solid blue;font-weight:bold;">
    retList is null
    </div>
    }
    </center>
    </div>
    <div class="col-sm-4"></div>
    </div>

    <div class="col-sm-12 row" style="height:200px;"> </div>