gistfile1.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using MathNet.Numerics.LinearAlgebra;

namespace MatrixMul
{
    class Program
    {
        static void Main(string[] args)
        {
            int N = 1000;

            Matrix m1 = new Matrix(N, N),
                   m2 = new Matrix(N, N),
                   m3 = new Matrix(N, N);
            Random r = new Random();

            for (int i = 0; i < N; i++)
            {
                for (int k = 0; k < N; k++)
                {
                    m1[i, k] = r.NextDouble();
                    m2[i, k] = r.NextDouble();
                }    
            }

            DateTime start = DateTime.Now;
            m3 = m1 * m2;
            DateTime stop = DateTime.Now;

            TimeSpan diff = stop - start;

            Console.WriteLine("Multiplyer time {0}\n", diff);
            Console.ReadKey();
        }
    }
}