Connectwise India Dot Net Fullstack Developer Interview Questions and Answers

Q1. Internal working of hashmap
Ans. 
HashMap is a data structure that stores key-value pairs and uses hashing to efficiently retrieve values.
• HashMap internally uses an array of linked lists to store key-value pairs.

• When a key-value pair is added, the key is hashed to find the index in the array where it will be stored.

• If multiple keys hash to the same index, a linked list is used to handle collisions.

• HashMap allows one null key and multiple null values.

• Th...read more
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Q2. What is singleton class and its implementation
Ans. 
Singleton class is a class that can only have one instance and provides a global point of access to it.
• Singleton class restricts the instantiation of a class to one object.

• It provides a way to access its unique instance globally.

• Commonly used in scenarios where only one instance of a class is needed, such as database connections or thread pools.
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Q3. Find all the pairs with given sum coding
Ans. 
The task is to find all pairs in an array that add up to a given sum.
• Iterate through the array and store each element in a hash set.

• For each element, check if the difference between the sum and the element exists in the hash set.

• If it does, add the pair to the result list.
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One question on Java on reversing only the numbers in an array
One question on React to build search component

Q1. Fundamentals in java, react and spring
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Q1. What is Middleware?
Ans. 
Middleware is software that acts as a bridge between an application's front end and back end, allowing them to communicate and interact.
• Middleware can handle tasks such as authentication, logging, error handling, and routing.

• It can be used to modify incoming requests or outgoing responses.

• Examples of middleware include Express.js middleware in Node.js applications and ASP.NET middleware in .NET applications.
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Q2. What is Dependency Injection ?
Ans. 
Dependency Injection is a design pattern where components are given their dependencies rather than creating them internally.
• Allows for better code reusability and testability

• Reduces coupling between components

• Promotes separation of concerns

• Examples: Constructor Injection, Setter Injection, Interface Injection
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Q3. What is Solid Principles ?
Ans. 
Solid Principles are a set of five design principles for writing clean, maintainable, and scalable code.
• Single Responsibility Principle: A class should have only one reason to change.

• Open/Closed Principle: Classes should be open for extension but closed for modification.

• Liskov Substitution Principle: Objects of a superclass should be replaceable with objects of its subclasses without affecting the program's correctness...read more
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Q1. Redis cache and distributed cache
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Q2. CORS , Trigger, OOPS , Queries
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Basic level of maths and some coding related questions

On current affairs and daily routine

Two basic questions related to pattern string array etc

Q1. This is final step and would be conducted in their office itself
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Q2. It will include some oops questions bond discussion and questions on Resume
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Q1. What is .Net Core ?
Ans. 
.Net Core is a free, open-source, cross-platform framework for building modern, cloud-based, internet-connected applications.
• Developed by Microsoft as the successor to the .NET Framework

• Supports multiple operating systems like Windows, macOS, and Linux

• Provides high performance and scalability for web applications

• Includes a modular and lightweight runtime called CoreCLR

• Allows developers to use C#, F#, and Visual Basic
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Q2. What is benefit of Microservices ?
Ans. 
Microservices offer benefits such as scalability, flexibility, and easier maintenance.
• Scalability: Microservices allow for individual components to be scaled independently, leading to better resource utilization.

• Flexibility: Each microservice can be developed, deployed, and updated independently, allowing for more flexibility in the development process.

• Easier maintenance: With microservices, it is easier to identify an...read more
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Q3. What is ViewBag and ViewData ?
Ans. 
ViewBag and ViewData are used in ASP.NET MVC to pass data from controller to view.
• ViewBag is a dynamic property that allows you to pass data from controller to view.

• ViewData is a dictionary object that allows you to pass data from controller to view.

• ViewBag is a dynamic object while ViewData is a dictionary object.

• Example: ViewBag.Title = 'Home Page'; ViewData['Message'] = 'Welcome to my website';
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Q4. What is CORS ?
Ans. 
CORS stands for Cross-Origin Resource Sharing, a security feature that allows servers to specify who can access their resources.
• CORS is a security feature implemented by browsers to prevent unauthorized access to resources on a different origin.

• It allows servers to specify which origins are allowed to access their resources through HTTP headers.

• CORS is commonly used to enable cross-origin requests in web applications, ...read more
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Q5. Explain JWT in Brief.
Ans. 
JWT is a compact, self-contained way to securely transmit information between parties as a JSON object.
• JWT stands for JSON Web Token.

• It consists of three parts: header, payload, and signature.

• It is commonly used for authentication and information exchange in web development.

• Example: eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IkpvaG4gRG9lIiwiaWF0IjoxNTE2MjM5MDIyfQ.SflKxwRJSMeKKF2QT4fwpMeJf3
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Q1. What is Middleware?
Ans. 
Middleware is software that acts as a bridge between an application's front end and back end, allowing them to communicate and interact.
• Middleware can handle tasks such as authentication, logging, error handling, and routing.

• It can be used to modify incoming requests or outgoing responses.

• Examples of middleware include Express.js middleware in Node.js applications and ASP.NET middleware in .NET applications.
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Q2. What is Dependency Injection ?
Ans. 
Dependency Injection is a design pattern where components are given their dependencies rather than creating them internally.
• Allows for better code reusability and testability

• Reduces coupling between components

• Promotes separation of concerns

• Examples: Constructor Injection, Setter Injection, Interface Injection
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Q3. What is Solid Principles ?
Ans. 
Solid Principles are a set of five design principles for writing clean, maintainable, and scalable code.
• Single Responsibility Principle: A class should have only one reason to change.

• Open/Closed Principle: Classes should be open for extension but closed for modification.

• Liskov Substitution Principle: Objects of a superclass should be replaceable with objects of its subclasses without affecting the program's correctness...read more
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Q1. Redis cache and distributed cache
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Q2. CORS , Trigger, OOPS , Queries
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