C# Program to Interchange the Rows of a Matrix

/*
 * C# Program to Interchange any 2 Rows of a Matrix
 */
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
 class interchangerow
 {
        int m, n;
        int[,] a;
        public interchangerow(int x, int y)
        {
            m = x;
            n = y;
            a = new int[m, n];
        }
        public void readmatrix()
        {
            Console.WriteLine("Enter the Elements : ");
            for (int i = 0; i < m; i++)
            {
                for (int j = 0; j < n; j++)
                {
                    Console.WriteLine("a[{0},{1}]=", i, j);
                    a[i, j] = Convert.ToInt32(Console.ReadLine());
                }
            }
        }
        public void printmax()
        {
            Console.WriteLine("Given Matrix : ");
            for (int i = 0; i < m; i++)
            {
                for (int j = 0; j < n; j++)
                {
                    Console.Write("{0}\t", a[i, j]);
 
                }
                Console.WriteLine();
            }
        }
        public void interchange()
        {
           Console.WriteLine("Enter the Row Number to Interchange : ");
            int i = Convert.ToInt32(Console.ReadLine());
            Console.WriteLine("Enter the Row Number with which " +
                              "Interchange is to be Accomplished :");
            int j = Convert.ToInt32(Console.ReadLine());
            for (int k = 0; k < n; k++)
            {
                int temp = a[i - 1, k];
                a[i - 1, k] = a[j - 1, k];
                a[j - 1, k] = temp;
            }
        }
        public static void Main()
        {
            int x, y;
            interchangerow obj; 
            Console.Write("Enter the Number of Rows");
            x = Convert.ToInt32(Console.ReadLine());
            Console.Write("Enter the Number of Columns");
            y = Convert.ToInt32(Console.ReadLine());
            obj = new interchangerow(x, y);
            obj.readmatrix();
            obj.printmax();
            obj.interchange();
            obj.printmax();
            Console.ReadLine();
        }
    }