G Tech Web Solutions ASP.NET Developer Interview Questions and Answers for Experienced

Q1. Explain solid principle
Ans. 
SOLID principles are a set of five design principles that help developers create more maintainable and scalable software.
• S - Single Responsibility Principle: A class should have only one reason to change.

• O - Open/Closed Principle: Software entities should be open for extension but closed for modification.

• L - Liskov Substitution Principle: Objects of a superclass should be replaceable with objects of its subclasses with...read more
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Q2. Why we use Sealed class
Ans. 
Sealed class is used to prevent inheritance and ensure that the class cannot be extended.
• Prevents inheritance, ensuring that the class cannot be extended

• Helps in maintaining code integrity and security

• Used when a class is not intended to be inherited or overridden
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Q3. Types of constructor
Ans. 
Types of constructors include default, parameterized, copy, and static constructors.
• Default constructor has no parameters

• Parameterized constructor takes one or more parameters

• Copy constructor creates a new object as a copy of an existing object

• Static constructor is used to initialize static data members
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Q4. . net core features?
Ans. 
ASP.NET Core is a cross-platform, high-performance framework for building modern, cloud-based, internet-connected applications.
• Cross-platform support allows development on Windows, macOS, and Linux

• High performance with improved speed and scalability

• Modular design for flexibility and easy maintenance

• Built-in dependency injection for better code organization

• Support for Docker containers for easy deployment
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Q5. Explain Startup file?
Ans. 
Startup file is a configuration file in ASP.NET that specifies settings and behavior for the application.
• Startup file is typically named 'Startup.cs' in ASP.NET Core projects.

• It contains configuration for services, middleware, and the request processing pipeline.

• The 'ConfigureServices' method is used to add services to the dependency injection container.

• The 'Configure' method is used to configure the HTTP request pipel...read more
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Q6. Dependency injection
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Q7. Explain Api lifetimes
Ans. 
API lifetimes refer to the duration for which an API is available and supported.
• API lifetimes can vary depending on the service provider or platform.

• Some APIs may have a limited lifetime and be deprecated after a certain period.

• Developers should be aware of API lifetimes to plan for potential changes or updates.

• Regularly check for updates or announcements regarding API lifetimes to stay informed.
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Q8. Diffrent between transient vs scope
Ans. 
Transient objects are created each time they are requested, while scoped objects are created once per request.
• Transient objects are created every time they are requested, leading to potentially higher memory usage.

• Scoped objects are created once per request and are shared within the scope of that request.

• Example: Transient objects are typically used for lightweight services, while scoped objects are used for services t
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Round duration - 45 Minutes
Round difficulty - Medium

Interviewer was good He asked me 2 coding questions while solving he gave some hints as well then we discussed about my projects.

Q1. Group Anagrams Together
You have been given an array/list of strings 'STR_LIST'. You are supposed to return the strings as groups of anagrams such that strings belonging to a particular group are a...read more
Ans. Sorting based Approach
The idea behind this approach is that two or more than two strings are anagrams if and only if their sorted strings are equal. So we will use a HashMap, let’s say “anagramGroup”, where each key is a sorted string, and the key will be mapping to the list of indices from the given list of strings that form a group of anagrams. This means that if we sort the strings at those indices, we will get the ...read more
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Q2. Bottom View Of Binary Tree
Given a binary tree, print its bottom view from left to right. Assume, the left and the right child make a 45-degree angle with the parent.
A binary tree is a tree in which eac...read more
Ans.  Recursive approach
The idea is to take two arrays and to store horizontal distance in one and priority of each node in another. The arrays are of size ‘2*N+1’(considering the worst case). On traversing the tree, if the current calculated horizontal distance is not present in the array, add it. Otherwise, compare the priority(stored in the second array) of the previously-stored value with the current one. If the priorit...read more
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Round duration - 50 Minutes
Round difficulty - Hard

In this interview she asked me one coding question and system design questions.

Q1. Merge Two BSTs
You are given two balanced binary search trees of integers having ‘N’ and ‘M’ nodes. You have to merge the two BSTs into a balanced binary search tree and return the root node to that balan...read more
Ans. Merge Inorder Traversal Of Both Trees
In this approach we will construct the merged BST, by merging the inorder of traversal of both the BST. By merging the inorder traversal of both BST we will get the inorder traversal of required BST. Then we will form the BST with that inorder traversal. 
 
The steps are as follows: 
 
1. Do the inorder traversal of first BST and store the inorder traversal in an array ...read more
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Q2. System Design Question
Design a URL shortening service
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