Consider the program:

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

namespace ConsoleApplication1
{
    class Sample
    {
        private int X;
        private int Y;

        public Sample()
        { 
            X = 5;
            Y = 10;
        }

        public void read()
        {
            Console.Write("Enter value of X: ");
            X = Convert.ToInt32(Console.ReadLine());

            Console.Write("Enter value of Y: ");
            Y = Convert.ToInt32(Console.ReadLine());
        }

        public void print()
        {
            Console.WriteLine("Value of X: " + X);
            Console.WriteLine("Value of Y: " + Y);
        }

    }
    class Program
    {
        static void Main(string[] args)
        {
            Sample S1 = new Sample();

            S1.print();

            Sample S2 = new Sample();

            S2.read();
            S2.print();


        }
    }
}

Output

Value of X: 5
Value of Y: 10
Enter value of X: 12
Enter value of Y: 15
Value of X: 12
Value of Y: 15

In this program, there is a class named "Sample", it contains default constructor and two private data members and two public methods that are operated on data members.