Understanding Icomparable Interface in C#

In this example we are sorting the contents in the objects referencing to the class.

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

namespace Apps

{

    class Test1 : IComparable<Test1>

    {

        public int x;

        public Test1(int x)

        {

            this.x = x;            

        }

        public int CompareTo(Test1 other)

        {

           //  return this.x - other.x;

            return this.x.CompareTo(other.x);

        }

    }

    class UnderstandingIcomparableInterface

    {

        public static void Main()

        {

            Test1 s1 = new Test1(110);

            Test1 s2 = new Test1(40);

            Test1 s3 = new Test1(90);

            Test1[] s = { s1, s2,s3 };         // Abjects array

            Array.Sort(s);  // Sorting the objects, CompareTo method is called.

            foreach (Test1 k in s)

            {

                Console.WriteLine(k.x);

            }

        }

    }

}