C# How to run a method using object vs thread vs task

In C#, you can run a method using various approaches, including using an object, a thread, or a task. I'll explain each approach separately.

Using an Object:

public class MyClass
{
    public void MyMethod()
    {
        // Your method logic here
        Console.WriteLine("MyMethod is running.");
    }
}

class Program
{
    static void Main(string[] args)
    {
        MyClass myObject = new MyClass();
        myObject.MyMethod(); // Call the method on the object
    }
}

In this approach, you create an instance of the class (an object) and then call the desired method on that instance.

Using a Thread:

using System;
using System.Threading;

public class MyClass
{
    public void MyMethod()
    {
        // Your method logic here
        Console.WriteLine("MyMethod is running.");
    }
}

class Program
{
    static void Main(string[] args)
    {
        MyClass myObject = new MyClass();

        // Create a new thread and start it to execute MyMethod
        Thread thread = new Thread(new ThreadStart(myObject.MyMethod));
        thread.Start();

        // Ensure the main thread doesn't exit immediately
        thread.Join();
    }
}

In this approach, you create a new thread and assign the method you want to run to that thread using ThreadStart. You then start the thread, which executes the method concurrently with the main thread. 

Note that thread is a kind of delegate and effectively, delegate is being used to run the method.

Using a Task (asynchronous approach):

using System;
using System.Threading.Tasks;

public class MyClass
{
    public void MyMethod()
    {
        // Your method logic here
        Console.WriteLine("MyMethod is running.");
    }
}

class Program
{
    static async Task Main(string[] args)
    {
        MyClass myObject = new MyClass();

        // Run the method asynchronously using Task
        await Task.Run(() => myObject.MyMethod());
    }
}

In this approach, you use the Task.Run method to execute the method asynchronously. This approach is more modern and commonly used, especially for asynchronous programming. Task is a wrapper around the thread. Here, again, you are using thread indirectly. Note that Task.Run takes different generic delegates such as Action, Func etc. as parameter.

Each approach has its use cases and implications, so choose the one that best fits your requirements based on concurrency needs and application structure.