We can't use this in static method because keyword 'this' returns a reference to the current instance of the class containing it. Static methods (or any static member) do not belong to a particular instance.

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

namespace this_example

{

    class Program

    {

        public class Demo

        {

            int age;

            string name;

            public Demo(int age, string name)

            {

                age = age;

                name = name; 

            }

            public void Show()

            {

                Console.WriteLine("Your age is :" + age.ToString());

                Console.WriteLine("Your name is : " + name);

            }

        }

        static void Main(string[] args)

        {

            int _age;

            string _name;

            Console.WriteLine("Enter your age : " );

            _age=Int32.Parse(Console.ReadLine());

            Console.WriteLine("Enter your name : ");

            _name=Console.ReadLine();

            Demo obj = new Demo(_age, _name);

            obj.Show();

            Console.ReadLine();

         }

    }

}