C# Files

Read and write files with File.

❮ Previous Next ❯

The static System.IO.File class handles common file tasks:

File.WriteAllText(path, text) and File.AppendAllText()
File.ReadAllText(path) and File.ReadAllLines(path)
File.Exists(path), File.Delete(path)
Async versions exist: File.ReadAllTextAsync().

Key Takeaways: C# Files

Mastering C# Files helps you write clean and reliable C# code. Follow standard conventions, test edge cases, and keep logic simple. Try running the code example below and complete the exercises to build confidence.

C# Files Code Example

string path = "notes.txt";
File.WriteAllText(path, "Learn C#\n");
File.AppendAllText(path, "Build APIs\n");

foreach (var line in File.ReadAllLines(path))
{
    Console.WriteLine($"> {line}");
}

File.Delete(path);
Console.WriteLine(File.Exists(path));

Output