EN CSharp Keyword do

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C#: do

Handbook C# · Practical Guide

Executes the body of the loop before the condition is checked, so at least once.

Simple example (Example.cs)

Save this example separately as Example.cs. Run it independently of the other examples on this page.

Example.cs:

// PROJECT-EXAMPLE
int count = 5;
do { System.Console.WriteLine(count); } while (count < 0);

Result:

5

Syntax

do { ... } while (condition);

Example 1: simple form

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
using System.IO;
using System.Runtime.InteropServices;
using System.Runtime.CompilerServices;

public static class Program
{
    public static async Task Main(string[] args)
    {
        int count = 0;
        do { Console.WriteLine(count++); } while (count < 3);
    }
}

Example 2: another practical form

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
using System.IO;
using System.Runtime.InteropServices;
using System.Runtime.CompilerServices;

public static class Program
{
    public static async Task Main(string[] args)
    {
        int value = 20;
        do { value /= 2; Console.WriteLine(value); } while (value > 3);
    }
}

Official source: Microsoft Learn.