Matrix representation in C#

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

namespace ConsoleApplication2
{
    class Program
    {
        static void Main(string[] args)
        {
            try
            {
                string i;

                string j;

                int m;

                int n;

                int no_of_rows = 0;

                int no_of_columns = 0;



                Console.WriteLine("Enter the number of rows ");

                i = Console.ReadLine();

                no_of_rows = Convert.ToInt32(i);



                Console.WriteLine("Enter the number of columns ");

                j = Console.ReadLine();

                no_of_columns = Convert.ToInt32(j);

                for (n = 0; n < no_of_rows; n++)
                {
                    
                    for (m = 0; m < no_of_columns; m++)
                    {

                        Console.Write(n.ToString()+m.ToString()+" ");

                    }

                    Console.WriteLine(" \n ");

                }

            }

            catch (Exception e)
            {

                Console.WriteLine("Exception occured: " + e.Message);
                
            }
    }
        }
    }

Enter the number of rows
4
Enter the number of columns
4

00 01 02 03

10 11 12 13

20 21 22 23

30 31 32 33