Override in built ToString() method in C# example

Below is the small source code which demonstrate how to override in built ToString() method in C# which is mostly used in exception handling.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace override_tostring_demo
{
    class A
    {
        public override string ToString()
        {
            return "Hello";
            //return base.ToString();
        }
        class M
        {
            static void Main(string[] args)
            {
                A a = new override_tostring_demo.A();
                Console.WriteLine(a);
                Console.ReadLine();
            }
        }
    }
}