System.IO Namespace

The System.IO namespace contains types that allow reading and writing to files and data streams, and provides basic file and directory support.

Classes

File

Provides static methods for the creation, copying, deletion, moving, and opening of files, and helps in the creation of FileStream objects.

Path

Provides methods for processing directory strings in a cross-platform manner.

Stream

Represents a sequence of bytes that can be read from, written to, or both.

FileInfo

Provides instance methods for the creation, copying, deletion, moving, and opening of files.

DirectoryInfo

Provides instance methods for creating, moving, and enumerating through directories and subdirectories.

Enums

FileAttributes – Represents the attributes of a file or directory.
FileMode – Specifies how the operating system should open a file.
FileAccess – Defines the access permissions for a file.
FileShare – Specifies the kind of access other FileStream objects can have to the same file.
SeekOrigin – Defines reference points for seeking within a stream.

Sample Code

using System;
using System.IO;

class Program
{
    static void Main()
    {
        // Write text to a file
        File.WriteAllText(@"example.txt", "Hello, System.IO!");

        // Read the file back
        string content = File.ReadAllText(@"example.txt");
        Console.WriteLine(content);
    }
}