Chapter 2: ⚙️ Methods, Namespaces, and Error Handling in .NET
Now that you can express logic with types, operators, and control flow, the next step is to structure programs so they scale: reusable methods, clear boundaries between libraries, dependency management with NuGet, and predictable failure handling.
You will learn how professional C# projects split responsibilities, how the runtime locates code in assemblies, and how to work with files and exceptions without turning every method into a tangle of special cases.
What you should already know
Work through Chapter 1 first: variables, reference vs value semantics at a high level, collections, and basic console programs.
Series in this chapter
- Series 6: Defining and Using Methods — parameters, returns, overloading, and expression-bodied members.
- Series 7: Namespaces, Assemblies, and NuGet Packages — organizing code, project references, and bringing in third-party libraries.
- Series 8: File Input/Output and Exception Handling — reading and writing files safely and designing robust
try/catchflows.
Suggested path
- Solidify methods so duplication drops and intent becomes obvious in your call sites.
- Learn namespaces and packages so you can integrate real-world libraries confidently.
- Finish with I/O + exceptions, because almost every application touches the file system or network—and both fail in interesting ways.
When you are comfortable here, continue to Chapter 3: Object-Oriented and Advanced C#.