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C# program to read all lines of a text file

In this C# program, we are going to learn how to read all lines of a text file? To read all lines, we use ReadAllLines() method of File class.
Submitted by IncludeHelp, on November 08, 2017

Give a text file and we have to read it’s all lines using C# program.


This is a method of "File class, which returns all lines (array of strings) from a text file.


String[] ReadAllLines(string filename);


  1. filename - name of the file.

Return value:

  1. This method return array of string, in which every element of array contains a line.


using System;

using System.IO;

namespace ConsoleApplication1
    class Program
        static void Main()
            int i = 0;
            string[] line;

            line = File.ReadAllLines("ABC.TXT");

            for (i = 0; i < line.Length; i++)


This is Line 1.
This is Line 2.
This is Line 3.
This is Line 4.
This is Line 5.

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

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