C# Program to Find the Sum of Each Column of the Matrix

/*
 * C# Program to Find Sum of the Elements of each Column 
 * of the Given Matrix
 */
using System;
using System.Collections.Generic;
using System.Text;
namespace matrix_col
{
    class mat
    {
        int i, j, m, n;
        int[,] a = new int[20, 20];
        int[,] c = new int[20, 20];
        public void getmatrix()
        {
            Console.WriteLine("Enter the Number of Rows : ");
            m = int.Parse(Console.ReadLine());
            Console.WriteLine("Enter the Number of Columns : ");
            n = int.Parse(Console.ReadLine());
            Console.WriteLine("Enter the Elements");
            for (i = 1; i <= m; i++)
            {
                for (j = 1; j <= n; j++)
                {
                    a[i, j] = int.Parse(Console.ReadLine());
                }
            }
            Console.WriteLine("Given Matrix");
            for (i = 1; i <= m; i++)
            {
                for (j = 1; j <= n; j++)
                {
                    Console.Write("\t{0}", a[i, j]);
                }
                Console.WriteLine();
            }
        }
 
        public void col()
        {
            int c;
            for (i = 1; i <= n; i++)
            {
                c = 0;
                for (j = 1; j <= m; j++)
                {
                    c = c + a[j, i];
                }
                Console.WriteLine("{0} Column Sum : {1}", i, c);
            }
        }
    }
    class matsum
    {
        static void Main(string[] args)
        {
            mat ma = new mat();
            ma.getmatrix();
            ma.col();
            Console.ReadLine();
        }
    }
}