EXAMPLE OF ICOMPARABLE INTERFACE

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

namespace ConsoleApplication

{

    public class Employee : IComparable

    {

        private int d, c;

        public Employee(int e, int f)

        {

            this.d = e;

            this.c = f;

        }

        public int CompareTo(Employee other)

        {

            int thisvalue = (this.d * 100) + this.c;

            int othervalue = (other.d * 100) + other.c;

            return thisvalue.CompareTo(othervalue);

        }

        public override string ToString()

        {

            // String representation.

            return this.d.ToString() + "," + this.c;

        }

        static void Main()

        {

            Employee[] sal ={new Employee(100,0),

                          new Employee(57,23),

                          new Employee(250,97)};

            Array.Sort(sal);

            // Uses IComparable.CompareTo()

            // Uses Employee.ToString

            foreach (var element in sal)

            {

                Console.WriteLine(element);

            }

        }

    }

}

COMPARE TO METHOD

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

namespace ConsoleApplication

{

    class Program

    {

        int a, b;

        public int method()

        {

            a = 3; b = 3;

            return b.CompareTo(a);

        }

        static void Main(string[] args)

        {

            Program p = new Program();

            int c = p.method();

            Console.Write(c);

        }

    }

}