How to declare 2D integer array in C#?

you can do it like this. See details here

int[,] array2D = new int[,] { { 1, 2 }, { 3, 4 }, { 5, 6 }, { 7, 8 } };

2D integer array

Declaration

int[,] array = new int[4, 2];

Initialization

int[,] array = new int[,] { { 1, 2 }, { 3, 4 }, { 5, 6 }, { 7, 8 } };

Complete explanation with example :http://msdn.microsoft.com/en-us/library/2yd9wwz4.aspx

i think you have not searched google....

follow below link to see tutorial http://www.tutorialspoint.com/csharp/csharp_multi_dimensional_arrays.htm

int [,] a = int [3,4] = {  
 {0, 1, 2, 3} ,   /*  initializers for row indexed by 0 */
 {4, 5, 6, 7} ,   /*  initializers for row indexed by 1 */
 {8, 9, 10, 11}   /*  initializers for row indexed by 2 */
};

Use MSDN for Micrsoft technologies, it is well documented http://msdn.microsoft.com/en-us/library/2yd9wwz4.aspx

It ranked #1 in google search for me when writing: 2d integer array c#

This page might also provide useful information: What are the differences between a multidimensional array and an array of arrays in C#?

int[,] array2D = new int[,] { { 1, 2 }, { 3, 4 }, { 5, 6 }, { 7, 8 } };

The sum2D() Method

private double sum2D(double[,] ar)
{
 double sum = 0.0;

 foreach (double d in ar)
      sum += d;

 return sum;
}