C# program to read text from a file and append in another file

In this C# program, we are going to read text from a file and append it to another file, to append text we will use File.AppendAllText() method.
Submitted by IncludeHelp, on October 28, 2017

Given a file, and we have to read text from the file and append the text in another file using C# program.


This is a method of "File" class, it is used to append given 'content' to the file which is specified by the 'path'.


void File.AppendAllText(path, content);


  1. path - Filename with its location.
  2. content - Text to be written into file.


using System;

//We need to include this namespace for file handling.
using System.IO;

namespace ConsoleApplication1
    class Program
        static void Main()
            string s;

            Console.WriteLine("Content before append:");
            s = File.ReadAllText("ABC.TXT");

            Console.WriteLine("Enter text to append into file:");
            s = Console.ReadLine();

            File.AppendAllText("ABC.TXT", s);

            Console.WriteLine("Content after append:");
            s = File.ReadAllText("ABC.TXT");



Content of file :
Content before append:
Hello , This is a sample program for writing text into file.
Enter text to append into file:
It is new Text.
Content after append:
Hello , This is a sample program for writing text into file.It is new Text.

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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