Writing
To LINQ or Not to LINQ
Repeated work can hide inside a short LINQ query. A customer-filtering benchmark separates string conversions, lookup choices, iteration and changed behavior.
Topic
Lambdas
Expressions that define anonymous functions where behavior is needed. Parameter inference, statement and expression bodies, captured variables and the required target type determine how they are used.
2 pages
Writing
So You Think You Know C#? Delegates and Higher Order Functions
Delegates let callers supply behavior to reusable methods. Lambda syntax and SingleElseException show how higher order functions add useful failure details.