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home / developersection / forums / what is the difference between file.writealltext() and file.appendalltext()?
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What is the difference between File.WriteAllText() and File.AppendAllText()?

Ravi Vishwakarma 455 05 May 2025

What is the difference between File.WriteAllText() and File.AppendAllText()?

c# c#
Updated 19 May 2025
Ravi Vishwakarma
Ravi Vishwakarma

IT-Hardware & Networking

Ravi Vishwakarma is a dedicated Software Developer with a passion for crafting efficient and innovative solutions. With a keen eye for detail and years of experience, he excels in developing robust software systems that meet client needs. His expertise spans across multiple programming languages and technologies, making him a valuable asset in any software development project.

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1 Answers

Anubhav Sharma
Anubhav Sharma 19 May 2025
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The difference between File.WriteAllText() and File.AppendAllText() in C# is in how they handle existing file content:

File.WriteAllText(path, contents)

  1. Overwrites the file if it already exists.
  2. Creates a new file if it doesn't exist.
  3. Use this when you want to replace the file’s content entirely.

Example:

File.WriteAllText("example.txt", "Hello, world!");

If example.txt already has data, it will be replaced with "Hello, world!".

File.AppendAllText(path, contents)

  1. Appends the text to the end of the file if it exists.
  2. Creates a new file if it doesn’t exist.
  3. Use this when you want to add content without deleting existing content.

Example:

File.AppendAllText("example.txt", "Appended line\n");

If example.txt already has "Hello, world!", after this call it will contain:

Hello, world!Appended line

Summary

Method Overwrites File Appends to File Creates File if Missing
File.WriteAllText Yes No Yes
File.AppendAllText No Yes Yes
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