Override in built ToString() method with Student class in C# example

Below is the small source code which demonstrate how to override in built ToString() method with Student class in C# which is mostly used in exception handling.

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

namespace override_student_tostring_demo
{
    public class Student
    {
        int rno, std;
        float per;
        string name;
        Student()
        {
            rno = std = 0;
            name = "";
            per = 0.0f;
        }
        public Student(int rno, string name, int std, float per)
        {
            this.rno = rno;
            this.std = std;
            this.name = name;
            this.per = per;
           
        }
        public override string ToString()
        {
            //return base.ToString(){
            return "Rollno" + rno.ToString() + "\nname" + name.ToString() + "Div" + std.ToString()+"Percentage"+per.ToString();
            //}
        }
    }
    class M
    {
        static void Main(string[] args)
        {
            Student s1 = new Student(1, "Amol", 12,98.1f);
            Console.WriteLine(s1);
            Console.ReadLine();
        }
    }
}