C# Programming/Keywords/break

The keyword break is used to exit out of a loop or switch block.

break as used in a loop

int x;
 
while (x < 20){

   if (x > 10) break;

   x++;
}

The while loop would increment x as long as it was less than twenty. However when x is incremented to ten the condition in the if statement becomes true, so the break statement causes the while loop to be broken and execution would continue after the closing parentheses.

break as used in a switch block

int x;

switch (x)
    {
    case 0:
        Console.WriteLine("x is 0");
        break;
    case 1:
        Console.WriteLine("x is 1");
        break;
    case 2:
        // falls through
    case 3:
        Console.WriteLine("x is 2 or 3");
        break;
    }

When the program enters the switch block, it will search for a case statement that is true. Once it finds one, it will read any further statements printed until it finds a break statement. In the above example, if x is 0 or 1, the console will only print their respective values and then jump out of the statement. However, if the value of x is 2 or 3, the program will read the same proceeding statement(s) until it reaches a break statement. In order not to show anybody who reads the code that this handling for 2 is the same for three, it is good programming practice to add a comment like "falls through" after the falling-through cases.

C# Keywords
abstract as base bool break byte case catch char checked class const continue decimal default delegate do double else enum event explicit extern false finally fixed float for foreach goto if implicit in int interface internal is lock long namespace new null object operator out override params private protected public readonly ref return sbyte sealed short sizeof stackalloc static string struct switch this throw true try typeof uint ulong unchecked unsafe ushort using var virtual void volatile while
Special C# Identifiers (Contextual Keywords)
add alias async await dynamic get global nameof partial remove set value when where yield
Contextual Keywords (Used in Queries)
ascending by descending equals from group in into join let on orderby select where