Droisys DOT NET Developer Interview Questions and Answers

Q1. What is Entity Framework and how does it function?
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Q1. Abstract class vs interfaces. What would i choose and why.
Ans. 
Abstract class is used when there is a need for default implementation, while interfaces are used for multiple inheritance.
• Abstract classes can have both abstract and non-abstract methods, while interfaces can only have abstract methods.

• Abstract classes can provide default implementations for methods, while interfaces cannot.

• Interfaces allow a class to implement multiple interfaces, but can only inherit from one abstra...read more
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Q2. Difference between .NET core, .NET framework and .NET
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NET core is a cross-platform, open-source framework for building modern, cloud-based, internet-connected applications. NET framework is a Windows-only framework for building Windows desktop applications. NET is a general term encompassing both .NET core and .NET framework.
• NET core is cross-platform and open-source, while .NET framework is Windows-only.

• .NET core is modular and lightweight, allowing for faster performanc...read more
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Q3. Pipelines and Middlewares in .NET. How would i configure them.
Ans. 
Pipelines and Middlewares in .NET are used for request processing and can be configured using middleware components.
• Pipelines in .NET are used to define a series of middleware components that process an HTTP request.

• Middlewares are components that can handle requests and responses in the pipeline.

• To configure pipelines and middlewares in .NET, you can use the 'UseMiddleware' method in the 'Configure' method of the Star...read more
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Q4. Difference between App.Use() and App.Run()
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App.Use() is used for adding middleware to the request pipeline, while App.Run() is used for handling the request directly.
• App.Use() is used to add middleware components to the request pipeline.

• App.Run() is used to handle the request directly without passing it to the next middleware component.

• App.Use() is typically used for setting up middleware like authentication, logging, etc.

• App.Run() is used for handling the fina...read more
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Q5. SOLID principles (S and O was asked)
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Q6. Dependency Inversion vs Inversion of Control. I had to write examples of constructor injection, method injection with the help of a DBContext file.
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Q7. String vs String Builder. Comparision of their mutability, speed, memory allocated, usability. Was provided a use case and asked which one to use and how. String Interpolation. String Manipulation.
Ans. 
String is immutable, while StringBuilder is mutable. StringBuilder is faster and more memory efficient for string manipulation.
• String is immutable, meaning once created, it cannot be changed. StringBuilder is mutable, allowing for efficient string manipulation.

• StringBuilder is faster than String for concatenating multiple strings, as it does not create a new string object each time.

• String uses more memory as it creates...read more
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Q8. Database Normalization (2NF was asked). Was given an sample dataset, asked to normalize and eliminate partial dependency. Given 2 entities Students and Class, establish relationships between them and prepa...read more
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Q9. Difference between Unique, Primary Key. Clustered and Non-Clustered Indices.
Ans. 
Unique, Primary Key, Clustered, and Non-Clustered Indices are all used in database management to enforce data integrity and improve query performance.
• Unique constraint ensures that all values in a column are unique, but allows NULL values.

• Primary Key constraint ensures that all values in a column are unique and not NULL. Each table can have only one Primary Key.

• Clustered Index physically reorders the way records in the...read more
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Q10. Prepare an example of JWT authentication and Oauth for an API.
Ans. 
JWT authentication and OAuth example for API
• Implement JWT authentication by generating a token upon user login and including it in the Authorization header of API requests

• Use OAuth for user authorization by obtaining access tokens from a third-party provider like Google or Facebook

• Ensure API endpoints validate JWT tokens and OAuth access tokens before allowing access to resources
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Q11. Difference between $.post and $.ajax.
Ans. 
Both $.post and $.ajax are methods in jQuery used for making AJAX requests, but $.ajax is more versatile and customizable.
• Both $.post and $.ajax are used for making AJAX requests in jQuery.

• $.post is a shorthand method for $.ajax with predefined settings for POST requests.

• $.ajax is more versatile and customizable, allowing for different types of requests and more options.

• Example: $.post('example.php', {data: 'example'},...read more
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Q12. Write a Linq query to fetch data the fastest.(i used iQueryable) Write a Linq query to check if a record exists in the table.(i used ANY)
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Q1. Depenency injejction
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Q2. Routings
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Code for prime numbers

Q1. Dependency injection
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Q2. Dispose and finalize
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Dispose is used to release unmanaged resources, while finalize is used for cleanup before an object is destroyed.
• Dispose is called explicitly by the developer, while finalize is called by the garbage collector.

• Dispose should be implemented in classes that directly use unmanaged resources like file handles or database connections.

• Finalize is used for cleanup tasks like closing files or releasing memory.

• Implement IDispos...read more
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Mettl aptitude reasoning and technical MCQ