C# -Threading - Execution Order

Question

When I execute threads th1,th2 and th3.They are executing one after another.How do i change my code so that the execution order is not predictable .(Without using Random).

public class Test
{
    static void Main()
    {

        Person p = new Person();
        p.Id = "cs0001";
        p.Name = "William";

        Thread th1 = new Thread(()=>ProcessOne(p));
        th1.Name = "ThreadOne";
        th1.Start();

        Thread th2 = new Thread(()=>ProcessTwo(p));
        th2.Name = "ThreadTwo";
        th2.Start();

        Thread th3 = new Thread(()=> ProcessThree(p));
        th3.Name = "ThreadThree";
        th3.Start();

        Console.ReadKey(true);
    }

    static void ProcessOne(Person p)
    {
         Console.WriteLine("Thread {0} is executing", 
         Thread.CurrentThread.Name);
          Console.WriteLine("Id :{0},Name :{1}", p.Id, p.Name);
    }

    static void ProcessTwo(Person p)
    {
        Console.WriteLine("Thread {0} is executing",
        Thread.CurrentThread.Name);
        Console.WriteLine("Id :{0},Name :{1}", p.Id, p.Name);
    }

    static void ProcessThree(Person p)
    {
        Console.WriteLine("Thread {0} is executing",
        Thread.CurrentThread.Name); 
        Console.WriteLine("Id :{0},Name :{1}", p.Id, p.Name);
    }
}

public class Person
{

    public string Id
    {
        get;
        set;
    }

    public string Name
    {
        get;
        set;
    }

}

Answer 1

In your code the order of execution is not predictable. The reason you see sequential calls is because your methods do very little work and by the time you start the next thread the first already finished. By the way when I ran your code I got this result:

Thread ThreadOne is executing
Thread ThreadTwo is executing
Id :cs0001,Name :William
Thread ThreadThree is executing
Id :cs0001,Name :William
Id :cs0001,Name :William

One can clearly see that the methods execute in parallel. Running the program multiple times you will get different results.