C# 0 The Complete Reference

break

 stops the 

for

 loop as soon as a factor is found. The use of 

break

 in this situation 

prevents the loop from trying any other values once a factor has been found, thus preventing 

inefficiency.

When used inside a set of nested loops, the 

break

 statement will break out of only the 

innermost loop. For example:

// Using break with nested loops.

using System;

class BreakNested {

  static void Main() {

    for(int i=0; i<3; i++) {

      Console.WriteLine("Outer loop count: " + i);

      Console.Write("    Inner loop count: ");

      int t = 0;

      while(t < 100) {

        if(t == 10) break; // terminate loop if t is 10

        Console.Write(t + " ");

        t++;

      }

      Console.WriteLine();

    }

    Console.WriteLine("Loops complete.");

  }

}

This program generates the following output:

Outer loop count: 0

    Inner loop count: 0 1 2 3 4 5 6 7 8 9

Outer loop count: 1

    Inner loop count: 0 1 2 3 4 5 6 7 8 9

Outer loop count: 2

    Inner loop count: 0 1 2 3 4 5 6 7 8 9

Loops complete.

As you can see, the 

break

 statement in the inner loop causes only the termination of that 

loop. The outer loop is unaffected.

Here are two other points to remember about