File I/O allows your application to read from and write to files. You'll learn how to work with text files and even more complex formats like XML and CSV.
📚 Example Code: Reading & Writing Text Files
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🔐 Pro Tip: Always handle exceptions when dealing with files, especially for non-existent files or read/write permissions.
🔧 How This Code Works
System.IO.File.WriteAllText() writes text to a file
System.IO.File.ReadAllText() reads all text from a file
filePath specifies the file location
🧠 Working with Other File Formats
CSV Files — Store data in a comma-separated format (use StreamReader and StreamWriter)
XML Files — Structured file format for data (use XmlDocument)
JSON Files — Use Newtonsoft.Json to read/write JSON
💡 StreamReader and StreamWriter are great for line-by-line file processing, especially for large files.
📂 Example Code: File Error Handling
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⚠️ Always handle exceptions when dealing with file I/O — it’s possible that the file you’re working with may not exist or have the proper permissions.