Matrix multiplication 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 rows_a;

                string columns_a;

                string rows_b;

                string columns_b;

                string m;

                string n;

                int[,] a = new int[4, 4];

                int[,] b = new int[4, 4];

                int[,] c = new int[4, 4];

 

                int i = 0;

                int j = 0;

                int k = 0;

                int l = 0;

                c[i, j] = 0;

                int no_of_rows_a = 0;

                int no_of_columns_a = 0;

                int no_of_rows_b = 0;

                int no_of_columns_b = 0;

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

                rows_a = Console.ReadLine();

                no_of_rows_a = Convert.ToInt32(rows_a);

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

                columns_a = Console.ReadLine();

                no_of_columns_a = Convert.ToInt32(columns_a);

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

                rows_b = Console.ReadLine();

                no_of_rows_b = Convert.ToInt32(rows_b);

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

                columns_b = Console.ReadLine();

                no_of_columns_b = Convert.ToInt32(columns_b);

                Console.WriteLine(" The values of A matrix is :");

                for (i = 0; i < no_of_rows_a; i++)

                {

                    for (j = 0; j < no_of_columns_a; j++)

                    {

                        m = Console.ReadLine();

                        k = Convert.ToInt32(m);

                        a[i, j] = k;

                    }

                }

                Console.WriteLine(" The values of B matrix is :");

                for (i = 0; i < no_of_rows_b; i++)

                {

                    for (j = 0; j < no_of_columns_b; j++)

                    {

                        n = Console.ReadLine();

                        l = Convert.ToInt32(n);

                        b[i, j] = l;

                    }

                }

 

                Console.WriteLine(" The matrix format of A is ");

 

                for (i = 0; i < no_of_rows_a; i++)

                {

                    for (j = 0; j < no_of_columns_a; j++)

                    {

                        Console.Write(" {0}", a[i, j]);

                    }

                    Console.WriteLine("");

                }

                Console.WriteLine(" The matrix format of B is ");

                for (i = 0; i < no_of_rows_b; i++)

                    {

                        for (j = 0; j < no_of_columns_b; j++)

                        {

                            Console.Write(" {0}",b[i,j]);

                        }

                        Console.WriteLine("");

                }

                if (columns_a == rows_b)

                {

                    for (i = 0; i < no_of_rows_a; i++)

                    {

                        for (j = 0; j < no_of_columns_b; j++)

                        {

                            c[i, j] = (a[i, 0] * b[0, j]) + (a[i, 1] * b[1, j]);

                            Console.Write("  ");

                        }

                        Console.WriteLine("");

                    }

                }

                else

                {

                    Console.WriteLine("The matrix multiplication cannot be performed: Logic violation");

 

                }

                Console.WriteLine(" The resultant matrix is");

                for (i = 0; i < no_of_rows_a; i++)

                {

                    for (j = 0; j < no_of_columns_b; j++)

                    {

                        Console.Write(" {0}", c[i, j]);

                    }

                    Console.WriteLine();

                }

            }

           catch (Exception e)
           {

               Console.WriteLine(e.Message);

           }
    }
        }
    }