while

The while statement executes a statement or a block of statements while a specified Boolean expression evaluates to true. Because that expression is evaluated before each execution of the loop, a while loop executes zero or more times. This differs from the do loop, which executes one or more times.

At any point within the while statement block, you can break out of the loop by using the breakstatement.

You can step directly to the evaluation of the while expression by using the continue statement. If the expression evaluates to true, execution continues at the first statement in the loop. Otherwise, execution continues at the first statement after the loop.

You also can exit a while loop by the goto, return, or throw statements.

Example

The following example shows the usage of the while statement. Select Run to run the example code. After that you can modify the code and run it again.

int n = 0;
while (n < 5)
{
    Console.WriteLine(n);
    n++;
}