Matrix

//Rextester.Program.Main is the entry point for your code. Don't change it.
//Compiler version 4.0.30319.17929 for Microsoft (R) .NET Framework 4.5

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

namespace Rextester
{
    public class Program
    {
        public static void Fill(int [,]matr, int n, int m)
        {
            Random rand = new Random();
            for(int i=0;i<n;i++)
            {
                for(int j=0;j<m;j++)
                {
                    matr[i,j] = rand.Next(0, 133);
                }
            }
        }
        static void Swap<T>(ref T a, ref T b)
        {
            T c = a;
            a = b;
            b = c;
        }
        public static void Print(int [,]matr, int n, int m)
        {
            for(int i=0;i<n;i++)
            {
                for(int j=0;j<m;j++)
                {
                    Console.Write(matr[i,j] + "\t");
                }
                Console.WriteLine();
            }
        }
        public static void Sort(int [,]matr, int n, int m)
        {
            for(int j=0;j<m;j++)
            {
                for(int i=0;i<n;i++)
                {
                    for(int z=0;z<n;z++)
                    {
                        if(matr[i,j] < matr[z,j])
                        {
                            Swap(ref matr[i,j], ref matr[z,j]);
                        }
                    }
                }
            }
        }
        public static void Main(string[] args)
        {
            Console.WriteLine("n = ");
            int n = Convert.ToInt32(Console.ReadLine());
            Console.WriteLine("m = ");
            int m = Convert.ToInt32(Console.ReadLine());
            int [,]matr = new int[n,m];
            Fill(matr, n, m);
            Console.WriteLine("Matrix");
            Print(matr, n, m);
            Sort(matr, n, m);
            Console.WriteLine("After sorting");
            Print(matr, n, m);
        }
    }
}