Nano's Blog

C# arrays are zero indexed; that is, the array indexes start at zero. Arrays in C# work similarly to how arrays work in most other popular languages There are, however, a few differences that you should be aware of.

When declaring an array, the square brackets ([]) must come after the type, not the identifier. Placing the brackets after the identifier is not legal syntax in C#.

// arrays.cs
using System;
class DeclareArraysSample
{
    public static void Main()
    {
        // Single-dimensional array
        int[] numbers = new int[5];

        // Multidimensional array
        string[,] names = new string[5,4];

        // Array-of-arrays (jagged array)
        byte[][] scores = new byte[5][];

        // Create the jagged array
        for (int i = 0; i < scores.Length; i++)
        {
            scores[i] = new byte[i+3];
        }

        // Print length of each row
        for (int i = 0; i < scores.Length; i++)
        {
            Console.WriteLine("Length of row {0} is {1}", i, scores[i].Length);
        }
    }
}

Output

Length of row 0 is 3
Length of row 1 is 4
Length of row 2 is 5
Length of row 3 is 6
Length of row 4 is 7

Using foreach on Arrays

using System;
class DeclareArraysSample
{
    public static void Main()
    {
        int[,] numbers = new int[3, 2] { { 9, 99 }, { 3, 33 }, { 5, 55 } };
        foreach (int i in numbers)
        {
            Console.Write("{0} ", i);
        }
    }
}

Output

9 99 3 33 5 55

- from msdn.com