How to receive data from thread? - Thread and call back methods.

How we can return some data from the thread? .net provides a call back method and you can call the call back method from the thread and send the data to the caller. Let's see a simple example.

namespace My_Samples
{
    using System;
    using System.Threading;

    //Declare the call back delegate.
    public delegate void CallBackMethod(int returnValue);

    public class MyClass
    {
        //Add a local variable for the deleage.
        private CallBackMethod callBack;
        //Add a constructor with delegate type as parameter.
        public MyClass(CallBackMethod c)
        {
            callBack = c;
        }
        public void MyMethod(object data)
        {
            Console.WriteLine(data.ToString());
            //The thread process is completed and now I am invoking the call back.
            if (callBack != null)
                callBack(100);
        }
    }

    class Program
    {
        //Declare the call back method
        public static void CallBackResult(int result)
        {
            Console.WriteLine("Call back method called {0}", result);
        }

        static void Main(string[] args)
        {
            //Pass the delegate as object
            MyClass obj = new MyClass(new CallBackMethod(CallBackResult));
            ParameterizedThreadStart entryPoint = new ParameterizedThreadStart(obj.MyMethod);
            Thread thread = new Thread(entryPoint);
            thread.Start("Hello world");
            Console.WriteLine("Main method is completed...");
            Console.ReadLine();
        }
    }
}