C# Sample code : for Join 2 Threads

using System.Threading;

namespace ThreadJoin
{
   class Program
   {

       public static Thread T1;
       public static Thread T2;

       public static void Main(string[] args)
       {
           T1 = new Thread(new ThreadStart(First));
           T2 = new Thread(new ThreadStart(Second));
           T1.Name = "T1";
           T2.Name = "T2";
           T1.Start();
           T2.Start();
           Console.ReadLine();

       }

       //thread T1 threadStart
       private static void First()
       {
           for (int i = 0; i < 5; i++)
           {
               Console.WriteLine(
                   "T1 state [{0}], T1 showing {1}",
                   T1.ThreadState,  i.ToString());
           }
       }

       //thread T2 threadStart
       private static void Second()
       {
           //what the state of both threads
           Console.WriteLine(
               "T2 state [{0}] just about to Join, T1 state [{1}], CurrentThreadName={2}",
               T2.ThreadState, T1.ThreadState,
               Thread.CurrentThread.Name);

           //join T1
           T1.Join();

           Console.WriteLine(
               "T2 state [{0}] T2 just joined T1, T1 state [{1}], CurrentThreadName={2}",
               T2.ThreadState, T1.ThreadState,
               Thread.CurrentThread.Name);

           for (int i = 5; i < 10; i++)
           {
               Console.WriteLine(
                   "T2 state [{0}], T1 state [{1}], CurrentThreadName={2} showing {3}",
                   T2.ThreadState, T1.ThreadState,
                   Thread.CurrentThread.Name, i.ToString());
           }

           Console.WriteLine(
               "T2 state [{0}], T1 state [{1}], CurrentThreadName={2}",
               T2.ThreadState, T1.ThreadState,
               Thread.CurrentThread.Name);
       }
   }
}