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100 C# Interview Questions
Course Introduction
Introduction (4:17)
Forum
Interview One
The Questions (0:31)
What is the difference between a value type and a reference type in C#? (3:07)
What is middleware in the ASP.NET Core pipeline? (2:03)
What is git and what are some of the benefits? (2:50)
What is a design pattern? (3:51)
How do you use git to start working on a repository? (1:37)
Interview Two
The Questions (0:29)
What is WinForms? (2:45)
What is WPF, and how does it differ from WinForms? (4:09)
Explain the difference between string and StringBuilder. (3:01)
How do MVC and Razor Pages differ? (3:09)
Explain the Factory pattern. (3:19)
Interview Three
The Questions (0:31)
What is XAML? (2:57)
What is the purpose of namespaces in C#? (3:01)
What does the var keyword do, and when can you use it? (2:36)
How is dependency injection configured in ASP.NET Core? (2:09)
What problem does the Observer pattern solve? (2:17)
Interview Four
The Questions (0:34)
Describe the steps in git from making a change to getting it into the repository. (1:24)
What is the MVVM pattern? (1:46)
How do you display a simple message box in WinForms? (0:47)
How do you display a simple message box in WPF? (1:17)
How does the using statement relate to resource management? (1:33)
Interview Five
The Questions (0:35)
What file defines environment-specific settings (e.g., Development vs. Production)? (2:25)
How does the Decorator pattern work? (1:31)
Define a dependency property in WPF. (1:16)
What is the difference between a Form and a Control in WinForms? (1:03)
Describe the Singleton pattern and a scenario for its use. (3:37)
Interview Six
The Questions (0:40)
What are the default options for settings in an ASP.NET Core project? (4:28)
Where would you store settings that were specific to your machine? (2:15)
How do you access settings in .NET? (2:33)
How do you add your own source for settings? (2:32)
Explain changes needed to get app config and web config to work in .NET (1:38)
Interview Seven
The Questions (0:37)
What is an event handler, and how do you wire one up? (0:46)
Compare the three dependency injection service lifetimes in .NET. (3:38)
What are the various ASP.NET Core web project types? (1:47)
Compare Abstract Factory vs. Factory Method. (1:52)
Explain the difference between git merge and git rebase. (2:44)
Interview Eight
The Questions (0:39)
Explain microservices vs monoliths and which you prefer. (4:36)
Explain Docking vs. Anchoring for layout in WinForms. (2:48)
How do you implement CORS in an ASP.NET Core app? (3:01)
Explain async/await and how it differs from using Task.Run. (4:04)
Describe the Facade pattern. (2:51)
Interview Nine
The Questions (0:42)
Compare an abstract class and an interface. When would you choose one over the other? (4:53)
What are generics in C#, and why are they useful? (3:44)
What is Dependency Injection, and how does it relate to patterns? (4:49)
What is the purpose of the .gitignore file and how do you use it? (4:12)
What techniques help virtualize large collections in a ListView or DataGrid in WPF? (3:24)
Interview Ten
The Questions (0:34)
How do you implement an MDI application in WinForms? (1:31)
Explain the difference between struct and class. (3:18)
What are some things to consider about nullability? (5:42)
What is boxing and unboxing? (3:17)
Describe the different types of properties and their options. (3:45)
Interview Eleven
The Questions (0:32)
Describe the difference between interfaces and inheritance. (7:16)
How do you create and switch to a new branch in git? (0:35)
Describe how you would implement logging in .NET. (5:16)
When would a method benefit from being async? (1:25)
Describe what health checks are and how they work. (2:58)
Interview Twelve
The Questions (0:35)
What is the difference between overloading and overriding a method? (3:15)
What is the difference between const and readonly? (2:11)
Explain the difference between shallow copy and deep copy. (3:20)
What is the difference between the stack and the heap? (2:57)
How does garbage collection work in C#? (4:52)
Interview Thirteen
The Questions (0:32)
What is the purpose of the finalize and dispose methods? (4:38)
Explain covariance and contravariance in generics. (3:14)
What are anonymous types in C#? (2:47)
What are Func<>, Action<>, and Predicate<> used for? (3:15)
Explain the async and await keywords. (4:56)
Interview Fourteen
The Questions (0:35)
How does exception handling work with async/await? (2:07)
What is reflection in C#? How is it used? (2:39)
What is dynamic and what is it used for? (2:15)
What is the difference between a record and a class? (4:51)
What is the difference between authentication and authorization? (2:36)
Interview Fifteen
The Questions (0:41)
Describe the IDisposable pattern and how you implement it correctly. (1:47)
What's the difference between a Razor page and a Razor Component? (2:15)
When would you use an API vs GRPC? (1:55)
Compare Entity Framework Code First to Database First. (2:42)
Explain the difference between public, private, protected, internal, and protected internal. (4:43)
Interview Sixteen
The Questions (0:35)
What is polymorphism and encapsulation? (4:42)
What is LINQ and when would you use it? (3:34)
What is your error-handling strategy in C#? (4:45)
Describe resolving a merge conflict in git step by step. (2:51)
Describe the various rendering options in Blazor. (3:55)
Tooling Interview
The Questions (0:31)
What is Docker and when would you use it? (5:33)
What is Bootstrap and what are its benefits? (2:53)
Explain what NuGet is and how it works. (3:37)
Explain YAML and JSON. (2:38)
What is Aspire and how does it help developers? (2:48)
Databases Interview
The Questions (0:45)
What are some differences between SQL and NoSQL databases? (10:17)
What are primary keys, clustered indexes, and non-clustered indexes in Microsoft SQL Server? (10:01)
Tell me about three database types you have used and what their strengths are. (2:48)
What are some safety factors to consider when connecting C# to a database? (6:13)
What are some things to consider when planning for database disasters? (8:22)
CI/CD Interview
The Questions (0:40)
What does CI/CD mean? (3:18)
What are the differences between Azure DevOps and GitHub for CI/CD? (3:38)
How do you check code quality in your CI/CD process? (3:20)
What tools or strategies can you use to protect applications secrets? (4:14)
How can a developer replicate the production environment locally? (2:45)
AI Interview
The Questions (0:39)
What is RAG and MCP? (4:52)
Explain how an LLM comes to a conclusion. (2:22)
What security implications are there around using AI in software development? (6:01)
Tell me how you use AI in software development. (3:48)
What are the benefits and drawbacks of integrating an LLM into a software product? (5:54)
Course Conclusion
Conclusion (2:21)
What does the var keyword do, and when can you use it?
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