A break statement will terminate

1. the closest enclosing loop, or
2. the switch statement

and return the program control to the statements right after the terminated statements (Docs, 2015).

For example

for (int i = 0; i <= 10; i++)
{
    if (i == 5)
    {
        break;
    }
    Console.WriteLine(i);
}

will print:

0
1
2
3
4

because the for loop is terminated when i is 5.

Live-code example

When break is used within a nested loop, it will only terminate the closest enclosing loop and return the control to the outer loop.

For example

for (int i = 0; i < 10; i++)
{
    for (int j = 0; j < 10; j++)
    {
        if (j > i)
        {
            break;
        }
        Console.Write($"{j}");
    }
    Console.WriteLine();
}

Output:

0
01
012
0123
01234
012345
0123456
01234567
012345678
0123456789

Live-code example

As discussed earlier, break statement is also used in switch statements.

References

1. Docs, M. (2015, July 20). break (C# Reference). Retrieved from https://docs.microsoft.com/en-us/dotnet/csharp/language-reference/keywords/break