C# File Handling with StreamReader and StreamWriter

When building real-world applications, storing and retrieving data permanently is an essential requirement. This text-based course guides you through the fundamentals of file input and output in C# using standard .NET library classes. You will transition from temporary in-memory data to persistent text files, ensuring your application data survives restarts and crashes. By completing this course, you will understand how to safely open, read, write, and close files while managing system resources efficiently. You will also learn to modernise your file operations using modern asynchronous patterns to keep your applications responsive. What you'll learn: - Understand the core concepts of file streams and resource management in .NET - Write data to text files using StreamWriter with proper formatting and encoding - Read and parse text files line-by-line or entirely using StreamReader - Implement the using statement to ensure resources are always safely closed and disposed - Apply asynchronous methods like ReadLineAsync and WriteLineAsync for modern, non-blocking I/O - Handle common file-system exceptions and validate file paths before execution This course begins with foundational concepts of stream-based I/O and basic file paths, then guides you through sequential reading and writing workflows, and concludes with robust error handling and asynchronous best practices. Every concept is illustrated with clear, written code explanations that you can study and apply at your own pace. This course is designed for beginner C# developers who understand basic syntax and want to learn how to interact with the local file system. No prior experience with file handling or stream operations is required.