do (C# Reference)

The do statement executes a statement or a block of statements enclosed in {} repeatedly until a specified expression evaluates to false.

Example

In the following example the do-while loop statements execute as long as the variable x is less than 5.

public class TestDoWhile 
{
    public static void Main () 
    {
        int x = 0;
        do 
        {
            Console.WriteLine(x);
            x++;
        } while (x < 5);
    }
}
/*
    Output:
    0
    1
    2
    3
    4
*/

Unlike the while statement, a do-while loop is executed once before the conditional expression is evaluated.

At any point within the do-while block, you can break out of the loop using the break statement. You can step directly to the while expression evaluation statement by using the continue statement; if the expression evaluates to true, execution continues at the first statement in the loop. If the expression evaluates to false, execution continues at the first statement after the do-while loop.

A do-while loop can also be exited by the goto, return, or throw statements.

C# Language Specification

For more information, see the following sections in the C# Language Specification:

• 5.3.3.8 Do statements

• 8.8.2 The do statement

See Also

Concepts

C# Programming Guide

Reference

C# Keywords

The do-while Statement (C+)

Iteration Statements (C# Reference)

Other Resources

C# Reference