using System;

​

public class student:IComparable{

private int USN;

public student(){USN=0;}

public student(int USN){this.USN=USN;}

public int RegNo{get{return USN;}}

int IComparable.CompareTo(object o){

student temp=(student)o;

if(this.USN>temp.USN) return 1;

if(this.USN<temp.USN) return -1;

else return 0;

}

​

public static void Main(string[] args){

student[] usestd=new student[3];

usestd[0]=new student(111);

usestd[1]=new student(100);

usestd[2]=new student(45);

​

try{Array.Sort(usestd);}

catch(Exception e){Console.WriteLine(e.StackTrace);}

Console.WriteLine("Array after Sorting: ");

foreach(student s in usestd)

Console.WriteLine(s.RegNo);

}

}