C# - How to Write Multiple (All) Lines to a File?

Learn, how to write all lines into a text file using C# program?
Submitted by IncludeHelp, on November 08, 2017 [Last updated : March 26, 2023]

Given multiple lines and we have to write all lines into a text file.

To write multiple (all) lines to a file in C#, we use File.WriteAllLines() method.


This is a method of "File" class, which is used to write all lines in a text file.


void WriteAllLines(string filename);


  1. filename - name of the file.

C# program to write multiple (all) lines to a file

using System;
using System.IO;

namespace ConsoleApplication1 {
  class Program {
    static void Main() {

      string[] line = {
        "Sample Line 1",
        "Sample Line 2",
        "Sample Line 3",
        "Sample Line 4",
        "Sample Line 5"

      File.WriteAllLines("sample.txt", line);

      Console.WriteLine("Data written successfully");


Data written successfully


In the above program, we need to remember, when we use "File" class, System.IO namespace must be included in the program.

C# File Handling Programs »

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