---
title: "C# Expert"
description: "This 3-day workshop takes experienced developers deep into C# and .NET: source generators, lambdas and closures, records, pattern matching and reflection."
url: https://tn-data.se/courses/csharp-expert/
type: workshop
lang: en
alternate: https://tn-data.se/sv/kurser/csharp-expert.md
site: https://tn-data.se/
image: https://tn-data.se/_astro/23._Pj5-UyO_Z2rSIhm.webp
---

# C# Expert

> Advanced C# and .NET in three days, from source generators to records and pattern matching.

## Workshop facts

- **Duration:** 3 days or 6 half days
- **Level:** Master
- **Language:** English, Swedish

In this workshop you go past the syntax and learn how the advanced parts of C# and .NET work. It is up to date with C# 14 and .NET 10. Most of it also applies if you work with older versions.

The workshop mixes presentations, live coding and hands-on exercises. Along with the language features, I show ways to keep your code clean, maintainable and reliable, and the best practices and tools I use myself.

### What You Will Learn

- Advanced C# 14 and .NET 10 features, through live coding, demonstrations and exercises.
- Modern patterns such as records, value objects and pattern matching, for cleaner and more maintainable code.
- How source generators, reflection and the .NET ecosystem work underneath.
- Practical techniques you can use with the latest C# version and with older ones.

### Who Is This Workshop For?

C# developers who want to master the advanced features of the language.

### Prerequisites

At least a year of work as a C# developer, and the skills covered in my [C# Fundamentals](https://tn-data.se/courses/csharp-fundamentals/) workshop. You should be comfortable with Visual Studio, lambda expressions and LINQ.

### Workshop Agenda

During the workshop, we cover the following topics.

- **The .NET Ecosystem**
    - .NET Framework vs. .NET Core vs. .NET
    - Top-level statements
    - .NET Standard
- **Source Generators**
    - Roslyn
    - Analyzers
    - Code-fixes
    - Source generators
- **Visual Studio**
    - Dev tunnels
    - Hot reload
    - HTTP files
- **Editor Config**
    - Controlling warnings and errors
- **From Delegates to Lambda**
    - Delegates
    - Anonymous methods
    - Lambda expressions
    - Func\<T> and Action\<T>
- **Advanced Lambda Expressions**
    - Refactoring using lambda expressions
    - Closures
    - Common problems with closures
- **Optimizing Lambda Expressions**
    - Recent lambda expressions improvements
    - Local Functions
- **Value Tuples**
    - Classic generic tuples
    - Anonymous types
    - Value Tuples
    - Deconstruct
- **Pattern Matching**
    - Switch statement
    - Null checks
- **Switch Expressions**
    - Discard
    - Patterns
- **Non-Nullable Reference Types**
    - Nullable value types
    - Non-nullable reference types
    - The null-forgiving operator
    - Null-coalescing assignment operator
    - Nullable attributes
- **Value Objects**
    - Primitive obsession
    - Implementing value objects
    - Equality
    - Comparing and sorting
    - Overriding ToString()
    - Always valid and Immutability
    - Immutable operations
- **Records**
    - Positional records
    - Records vs manually created value objects
    - Nondestructive mutation
    - Extending records
    - Struct and class records
- **Async**
    - Tasks
    - Waiting for tasks
    - Cancellation tokens
    - Async/await
- **Dynamic**
    - Dynamic types
    - ExpandoObjects
    - Dynamic binding
- **Reflection**
    - Working with types
    - Querying and inspecting our applications
    - Creating instances of types
    - Pros and cons of using reflection
- **What's New in C# 12, 13, and 14**
    - Primary constructors
    - Collection expressions
    - TimeProvider

The Async module gives you an introduction to async programming in C#. For the deep dive, see my two-day workshop [Asynchronous Programming in C#](https://tn-data.se/courses/asynchronous-programming-in-csharp/).

### About the Trainer

My name is [Tore Nestenius](https://tn-data.se/about/). I teach on-site and remotely, both directly for companies and through training companies in Europe. What I bring:

- I have trained developers since 2010 and taught several hundred courses and talks.
- I create, maintain and teach every course myself, and improve it after every delivery.
- I am a Microsoft .NET MVP.
- I co-founded [Edument](https://www.edument.se/), a Swedish training and consulting company, where I was CTO, developer and trainer.
- I work as an [independent senior .NET consultant](https://tn-data.se/consulting/), so I teach from real projects.
- I have worked with .NET and C# since 2002.
- I hold the Azure AZ-204 and AZ-900 certifications.
- I co-founded the [.NET Skåne](https://www.meetup.com/net-skane/) user group.

![Tore Nestenius teaching a course](https://tn-data.se/_astro/Tore-in-action-1.6Zvr4mPb_10GDS1.webp)

### Training FAQs

#### Do you provide both on-site and remote training classes?

Yes, I provide both types of training.

#### Do you provide training in both Swedish and English?

Yes, both options are available. All my course materials are in English and I can teach the class in either Swedish or English.

#### Do you do half-day training?

When I run on-site, I usually do full-day classes. For remote training, I can provide options for both half and full days.

#### Do you do webinars and shorter talks?

Yes, please visit my [Talks](https://tn-data.se/talks/) page for more details.

#### Do you provide customized courses?

Yes, I do. [Contact me](https://tn-data.se/contact/) for more information.

To book this workshop or ask about it, see the [contact page](https://tn-data.se/contact/).