C# Tutorial 9.1 File I/O - Reading from and writing to files

 Here's a basic tutorial on File I/O (Input/Output) in C# for reading from and writing to files. File I/O is an essential part of many applications for tasks such as storing and retrieving data, configuration settings, and more.

Reading from Files:

Step 1: Import Necessary Namespace

using System;
using System.IO;

Step 2: Reading Text from a File

class Program
{
    static void Main()
    {
        // Specify the path to the file
        string filePath = "path/to/your/file.txt";
        // Check if the file exists
        if (File.Exists(filePath))
        {
            // Read all lines from the file into an array
            string[] lines = File.ReadAllLines(filePath);
            // Display the content of the file
            foreach (string line in lines)
            {
                Console.WriteLine(line);
            }
        }
        else
        {
            Console.WriteLine("File not found");
        }
    }
}

Step 3: Reading Binary Data from a File

class Program
{
    static void Main()
    {
        string filePath = "path/to/your/file.bin";
        if (File.Exists(filePath))
        {
            // Read all bytes from the file
            byte[] data = File.ReadAllBytes(filePath);
            // Process the binary data as needed
            // (e.g., convert to text, parse as specific format)
        }
        else
        {
            Console.WriteLine("File not found");
        }
    }
}

Writing to Files:

Step 1: Import Necessary Namespace

using System;
using System.IO;

Step 2: Writing Text to a File

class Program
{
    static void Main()
    {
        string filePath = "path/to/your/output.txt";
        // Content to be written to the file
        string content = "Hello, File I/O in C#!";
        // Write the content to the file
        File.WriteAllText(filePath, content);
        Console.WriteLine("File written successfully");
    }
}

Step 3: Writing Binary Data to a File

class Program
{
    static void Main()
    {
        string filePath = "path/to/your/output.bin";
        // Binary data to be written to the file
        byte[] data = { 0x48, 0x65, 0x6C, 0x6C, 0x6F }; // ASCII values for "Hello"
        // Write the binary data to the file
        File.WriteAllBytes(filePath, data);
        Console.WriteLine("File written successfully");
    }
}

These examples cover basic file operations in C#. You can customize them based on your specific needs and handle exceptions to enhance the robustness of your file I/O operations.