C# Development for Beginners #17: LINQ - Query Your Data - The Feature That Changes Everything
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Video Description
Stop writing loops! LINQ lets you filter, sort, and transform data with clean, readable code. This is the moment C# clicks for most developers.
What you'll learn: • What LINQ is and why it's magical • Lambda expressions (the 'equals arrow' syntax) • Where, Select, OrderBy - your core operations • First, FirstOrDefault, and when to use each • GroupBy for data aggregation (subject averages, counts) • Method syntax vs Query syntax (and why method wins) • Deferred execution and ToList() • Common gotchas (multiple enumeration, null collections) • Real-world examples (sales analysis, gradebook stats)
Key insights: • LINQ replaces loops - describe WHAT you want, not HOW • Lambda expressions = anonymous functions (way less code!) • Method syntax is what everyone actually uses • Deferred execution is a feature, not a bug • Once you learn LINQ, it works everywhere (DB, XML, JSON) • GroupBy unlocks powerful data analysis • Zero temporary variables = fewer bugs
We'll build: • Student gradebook with filtering and sorting • Sales analysis with grouping and aggregates • Real business logic examples
Previous Video: Collections - Lists and Arrays Next Video: More LINQ Power ► Full Playlist: https://www.youtube.com/playlist?list=PLGxFXI4dC2shfDgudNdh1FtSLcAZG0-Ba ► Code Repository: https://github.com/benday-inc/csharp-for-beginners-2025
That moment when LINQ clicks? Hit that like button! Subscribe and enable notifications - LINQ is about to change how you write code. Which LINQ method do you use most? Let me know in the comments!
#CSharp #LINQ #Lambda #DotNet #Programming #DataQuery #CodingTutorial #LearnToCode
0:00 Overview 0:35 Life Before LINQ 1:27 The LINQ Way 2:18 Lambda Expressions: The Arrow Syntax 2:36 Lambda vs. Regular Functions 3:11 Lambda Expressions: The Arrow Syntax 4:03 Common LINQ Methods Reference 4:32 Where: Filtering Data 5:07 Select: Transforming Data 5:43 First and FirstOrDefault 6:24 OrderBy: Sorting Made Simple 7:09 Query Syntax vs Method Syntax 8:04 Deferred Execution 8:21 Deferred Execution in Action 9:11 GroupBy: The Power Tool 10:03 GroupBy with Aggregates 10:46 LINQ Gotchas 11:49 Real-World Example: Sales Analysis 12:14 Key Takeaways 13:31 Practice Challenge
Video Info
- Duration: 15:04
- Published: November 20, 2025
