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Algorithms and Data Structures in C#: Complete Tutorial (Udemy.com)

Learn data structures and algorithms in C# from A to Z. Pass coding interview. Learn unit testing and TDD in addition.

Created by: Engineer Spock

Last updated February 2026

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What you will learn

  • Implement all the common data structures such as List, Stack, Queue and others understanding how they work under the covers
  • Use available data structures built-in .NET correctly: choose right data structures, understanding how they work under the covers
  • Pass coding interviews where interviewers torture you by asking to implement different algorithms and data structures
  • Solve custom problems related to algorithms and data structures, so you'll be able to combine data structures and re-implement algorithms suiting them for concrete cases
  • Implement Binary Search Tree
  • Understand and Apply Hash Tables
  • Understand and Apply Symbol Tables
  • Understand and Apply Heaps

How it compares

Against the other 194 rated Udemy courses in C# on CourseDuck:

  • Rating4.6 out of 5higher than 76% of them
  • Reviews2,310#28 of 195 by number of reviews
  • Length18.5 hourslonger than 86% of them
  • Last updatedFebruary 2026more recently than 79% of them

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Course Description

Why learn about data structures and algorithms? 

Algorithms and data structures constitute the fundamentals of programming.

  • Good understanding of algorithms and data structures is one of the most important requirements for a great number of work positions. You'll have to solve  many problems related to algorithms and data structures at coding interviews. Indeed, you can live without an understanding of algorithms and data structures, in general. However, you can do that until you face a real problem which requires to choose right data structures and implement custom algorithms. If you haven't ever faced such problems, believe me, this is just a matter of time. One day, you'll face such a problem and if you don't understand algorithms and data structures in depth, you'll feel yourself ashamed and helpless. You'll be stuck.

  • If you're not good at algorithms and data structures, you'll never pass a coding interview in a decent company. Almost all the companies   prefer to hire those developers who have good understanding of algorithms and data structures, remember that.  Do not delay the study of fundamental concepts.

  • Better hardware is not a solution  for all the performance-related problems. Sometimes, you need to write software for very slow devices. And that very often depends on the budget of a customer, by the way, so you don't have a control over it.

  • You'd better to understand what's going on under the hood at least one level in-depth. Indeed, if you don't understand how List works, sometimes you'll make sub-optimal or completely wrong decisions.

Why this course?

You may ask me "why should I take exactly your course?" And here is my answer:

  • This course is a comprehensive tutorial which covers a great number of topics

  • I tried to do my best to make this course not dry

  • This course concentrates not only at algorithms and data structures in general but it uncovers the internals of data structures and algorithms built-in .NET BCL (.NET Core's BCL is the same regarding fundamental data structures and algorithms)

  • This course is practical with exercises and solutions

  • This course will definitely help you to pass technical interviews

  • This course is made by a professional software developer with more than 10 years of real-world experience

  • and many other reasons :)

What's in the Course?

For now, the course covers:

  • Introduction to Algorithms and Data Structures: what is a data structure, abstract data type and what's the difference between these notions. What is an algorithm and why they are important to us?

  • Introduction to Algorithm Analysis:  determine how long will a program work, build a log-log plot, approximations, order of growth (Big-O notation), memory consumption

  • Arrays: arrays in C#, arrays in memory, time complexity of operations on arrays

  • Sort Algorithms: bubble sort, selection sort, insertion sort, recursion, shell sort, merge sort, quick sort, stability of sort algorithms

  • Lists: List built-in .NET BCL, nodes, linked list including singly and doubly linked lists, linked list built-in .NET

  • Stacks: theory and practice; stack based on array, stack based on a linked list, stack built-in .NET

  • Queues: theory and practice; queue based on array, circular queue, queue based on linked list, queue built-in .NET BCL

  • Search Algorithms: linear search, binary search (more will be added in the future)

  • Symbol Tables: intro, API, sequential search-based, binary search-based

  • Hash Tables: intro, hash functions, GetHashCode, approaches to collisions resolving: separate chaining and linear probing, Dictionary built-in BCL, Sets in BCL

  • Trees: binary search tree (BST), implementing BST (more will be added in the future)

  • Heaps: intro, heaps and arrays, implementation, Heap Sort (more will be added in the future, specifically about Priority Queues)

  • Immutable Collections: immutability and memory pressure, immutable stacks and queues, immutable list, immutable sets, immutable dictionaries, builders in immutable collections

  • Different Algorithms. This section will include different algorithms as you might guess. For now it convers the Sieve of Eratosthenes.

Take this course now and you'll be satisfied! Don't forget that Udemy provides 30-day money back refund policy, so if you don't like the course, you just click on a couple of buttons and get your money back!

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Instructor Details

Engineer Spock

I'm thankful enough for that I love what I do.

I began my career as a postgraduate student participating in Microsoft ImagineCup contest.

I've been working with .NET platform since 2003. I've been professionally architecting and implementing software for nearly 7 years, primarily based on .NET platform. I'm passionate about building rich and powerful applications using modern technologies. I'm a certified specialist in Windows Applications and Service Communication Applications by Microsoft. I'm one of the coordinators of the MSK.NET User Group in Moscow.

"If it's work, we try to do less. If it's art, we try to do more." - Seth Godin.

What I can say is that software is my art.

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Reviews

4.6

2,310 ratings on Udemy

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By Salil Oak on 3/14/2025

This course is great for getting a good understanding of Data structures, the lecturer covers many critical parts in good and concise tone

By Jay Pedersen on 5/2/2022

Solid C# implementations of fundamental algorithms and analysis of their time complexity. I felt I learned a significant amount about using C# to implement algorithms and how to use NUnit to test C# code. CON: a bit minor BUT ... code not provided for Immutable and Concurrent Collections section. That should be rectified.

By Ronald Edmeades on 9/12/2021

I feel like the word 'trivial' is overused! If you are a student trying to get to grips with the concepts, and because the material moves at speed, being told something is trivial is not helpful - anything is 'trivial' if you understand it... Thanks.

By Vern_russell@hotmail.com Russell on 2/3/2021

Good match. Excellent material. Would like some more depth in places, but the quick overview is great too. It gives me several things to try for practice and covered several knowledge gaps that were not filled previously.

By Micah Helm on 5/10/2020

Informative course with lots of good teaching points. One of the best courses I have seen covering all the core competencies required for a coding interview. Highly Recommended if this is a career path you want to pursue.

By Igli Draci on 2/18/2020

Great so far. The only thing I would like to mention is that even if someone knows the hash function still can not get the original password from the hash value, I mean that is the whole point of one way hash functions.

By Pavel Chebotkov on 10/20/2019

The whole course is easy for understanding and interesting to watch. And that's thanks to instructor. Even if I had some knowledge base in data structures this course was sufficiently useful for me. So I've consolidate a lot of my skills and have found something new for me.

By Redar Ismail on 8/19/2019

the course is great, but the instructor is not responsive, and recursion is important but only one video is made about it, other than that it is amazing course

By James Zachary Sherman on 8/12/2019

I have taken alot of udemy courses and I can say I am honestly impressed. Most DS and algos courses gloss over topics of how computers store data and manage it via memory mapping, yet this course covers the theory and practical use beautifully. This course thus far is in depth, impressive, and very much worth my time and money. As an update, I am almost down with the course and just finished linear probing. The insight, knowledge, and general ease of introduction are all still there for each topic and I am incredibly happy with the course load. Kudos also for explaining memory consumption and load factor for these topics as well!

By Nikilesh.S.V srinivas on 12/14/2018

If questions about data structure and algorithms in interviews make you nervous then this is the course for you. This course is a hit with me. There are hardly any course available for DS and algorithm for c# developers on online and what ever is available is not up to the mark. this is the best available one currently as of now.one of a kind. I believe, If more topics can be added and more exercises can be attached and make the course more comprehensive along with the tough coding questions (related to DS) asked in the industry, then it can surely become a course which can transform someones life!

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Overall Score : 92 / 100