How to declare a two-dimensional array in C#

A 2-dimensional array is a list of one-dimensional arrays. Declare it like the two dimensional array shown below −

int [,] a

Two-dimensional arrays may be initialized by specifying bracketed values for each row.

int [,] a = new int [4,4] {
{0, 1, 2, 3} ,
{4, 5, 6, 7} ,
{8, 9, 10, 11} ,
{12, 13, 14, 15}
};

The following is an example showing how to work with two-dimensional arrays in C# −

Example

 Live Demo

using System;

namespace ArrayApplication {
   class MyArray {
      static void Main(string[] args) {
         /* an array with 3 rows and 2 columns*/
         int[,] a = new int[3, 2] {{0,0}, {1,2}, {2,4} };
         int i, j;

         /* output each array element's value */
         for (i = 0; i < 3; i++) {

            for (j = 0; j < 2; j++) {
               Console.WriteLine("a[{0},{1}] = {2}", i, j, a[i,j]);
            }
         }
         Console.ReadKey();
      }
   }
}

Output

a[0,0] = 0
a[0,1] = 0
a[1,0] = 1
a[1,1] = 2
a[2,0] = 2
a[2,1] = 4