Console.WriteLine / ReadLine

Syntax

Console.WriteLine(value);

Examples

Console.WriteLine("Hello, World!");
Console.WriteLine(42);

Console.Write("No new line here... ");
Console.Write("still the same line.");
Console.WriteLine();  // move to a new line manually

string name = "Fola";
int score = 87;

Console.WriteLine($"{name} scored {score}%");
Console.WriteLine($"Next year: {score + 1}");

Console.Write("What is your name? ");
string? name = Console.ReadLine();

Console.WriteLine($"Hello, {name}!");

Console.Write("Enter your age: ");
string? input = Console.ReadLine();
int age = int.Parse(input ?? "0");

Console.WriteLine($"Next year you will be {age + 1}");

Best practices

• Use string interpolation ($"...") instead of string concatenation with + for building readable, dynamic output
• Remember Console.ReadLine() can return null (e.g. if input is redirected from an empty stream) - handle that case rather than assuming a value
• Use int.TryParse() instead of int.Parse() when reading user input you have not already validated, to avoid a FormatException crashing the program
• Reach for a proper logging framework instead of Console.WriteLine() in real applications beyond simple scripts and console tools

At a glance

Purpose

Applications on the .NET platform

File extension

.cs

Runs in

.NET runtime

Usually used with

.NET SDK and libraries

Specifications & further reading

• C# language reference

Related C# documentation