In this module, you will master the art of selecting and implementing the most appropriate data structures for different programming scenarios, a critical skill that separates efficient applications from poorly performing ones. Building on your object-oriented programming foundation, you'll learn to work with C#'s rich collection framework including arrays, lists, dictionaries, sets, stacks, and queues. You'll understand not just how to use these data structures, but when and why to choose one over another based on performance characteristics and specific use cases. Additionally, you'll explore modern C# collection features including collection expressions and advanced initialization techniques that make your code more concise and readable. Through performance analysis using Big O notation, you'll develop the analytical skills to predict and optimize application performance. By the end of this module, you'll confidently select the right data structure for any programming challenge and implement collections efficiently using modern C# best practices.

In this module, you will master the critical skills needed to build robust, fault-tolerant applications that handle real-world challenges gracefully. You'll learn comprehensive exception handling strategies that prevent application crashes and provide meaningful error recovery, essential skills for professional software that must maintain uptime in production environments. Additionally, you'll explore the full spectrum of input/output operations including file system management, text processing, and advanced stream operations that enable applications to persist data and communicate with external systems. Through systematic debugging of complex I/O scenarios and exception conditions, you'll develop the troubleshooting expertise needed to maintain reliable applications in enterprise environments. By the end of this module, you'll create applications that not only function correctly under ideal conditions but also handle errors gracefully, process data efficiently, and maintain reliability even when encountering unexpected situations.