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

Question

Anubhav Kumar · Answer

The difference between File.WriteAllText() and File.AppendAllText() in C# is in
how they handle existing file content:
File.WriteAllText(path, contents)
Overwrites the file if it already exists.Creates a new file if it doesn't exist.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)
Appends the text to the end of the file if it exists.Creates a new file if it doesn’t exist.Use this when you want to add content without deleting existing content.
Example:
File.AppendAllText("example.txt", "Appended line
");
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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What is the difference between File.WriteAllText() and File.AppendAllText()?

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1 Answers

`File.WriteAllText(path, contents)`

`File.AppendAllText(path, contents)`

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