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

namespace ArrayofElements
{
    class student
    {
        public String rollno;
        public String name;
        public student(String rollno, String name)
        {
            this.rollno = rollno;
            this.name = name;
        }
    }
    class Program
    {
        static void Main(string[] args)
        {
            student[][] obj = new student[3][];
            for (int i = 0; i < obj.Length; i++)
            {
                obj[i] = new student[3];

            }

            for (int i = 0; i < obj.Length; i++)
            {
                for (int j = 0; j < obj.Length; j++)
                {
                    Console.WriteLine("Enter Name : ");
                    String arr = Console.ReadLine();
                    Console.WriteLine("Enter Roll Number : ");
                    String arrr = Console.ReadLine();
                    int a = arr.Length;
                    obj[i][j] = new student(arrr, arr);
                }
            }
            Console.WriteLine("\n Student Details are : \n");
            for (int i = 0; i < obj.Length; i++)
            {

                for (int j = 0; j < obj.Length; j++)
                {
                    Console.WriteLine("Name: {0} Roll No: {1}", obj[i][j].name,obj[i][j].rollno);
                }
            }
            int flag = 0;
            Console.WriteLine("Enter student Roll No. to be searched: ");
            String n = Console.ReadLine();
            for (int i = 0; i < obj.Length; i++)
            {
                for (int j = 0; j < obj.Length; j++)
                {
                    if (obj[i][j].rollno == n)
                    {
                        flag = 0;
                        Console.WriteLine("{0}", obj[i][j].name);
                    }
                    else if(obj[i][j].rollno != n)
                    {
                        flag = 1;
                    }
                }
            }
            if (flag == 1)
            {
                Console.WriteLine("Roll number not found");
            }
            else
            {
                Console.WriteLine("Roll number found");
            }
                Console.ReadKey();
        }
    }
}