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C# - Read Text from a File and Append in Another File

Here, we will learn how can we read text from a file and append in another file using C# program?
Submitted by IncludeHelp, on October 28, 2017 [Last updated : March 23, 2023]

Reading and Appending Text to a File

To read and append text to a file, we use File.AppendAllText() function, which is a function of the File class. It accepts two parameters path and content.

Syntax:

void File.AppendAllText(path, content);

C# program to read text from a file and append in another 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(s);

      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");
      Console.WriteLine(s);

    }
  }
}

Output

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.