C# 0 The Complete Reference

foreach

 cycles through the array one element at a time, from start to finish.

One important point to remember about 

foreach

 is that the iteration variable 

loopvar

 is 

read-only. This means you can’t change the contents of an array by assigning the iteration 

variable a new value.

Here is a simple example that uses 

foreach

. It creates an array of integers and gives it 

some initial values. It then displays those values, computing the summation in the process.

// Use the foreach loop.

using System;

class ForeachDemo {

  static void Main() {

    int sum = 0;

    int[] nums = new int[10];

    // Give nums some values.

    for(int i = 0; i < 10; i++)

      nums[i] = i;

    // Use foreach to display and sum the values.

    foreach(int x in nums) {

      Console.WriteLine("Value is: " + x);

      sum += x;

    }

    Console.WriteLine("Summation: " + sum);

  }

}

The output from the program is shown here:

Value is: 0

Value is: 1

Value is: 2

Value is: 3

Value is: 4

Value is: 5

Value is: 6

Value is: 7

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Value is: 8

Value is: 9

Summation: 45

As this output shows,