10+ Junior .NET Developer Interview Questions and Answers for Freshers

SQL query to retrieve the maximum salary from a database

• Use the SELECT statement with the MAX function to retrieve the maximum salary

• Specify the column name for the salary field in the table

• Example: SELECT MAX(salary) FROM employees

Code for prime and odd numbers

• For prime numbers, check if the number is divisible by any number less than itself

• For odd numbers, check if the number is not divisible by 2

• Use loops and conditional statements to implement the checks

• Consider edge cases such as negative numbers and 0

Key concepts of OOP include encapsulation, inheritance, polymorphism, and abstraction.

• Encapsulation: Bundling data and methods that operate on the data into a single unit (class). Example: Class with private fields and public methods.

• Inheritance: Creating new classes based on existing classes, inheriting their attributes and behaviors. Example: Subclass extending a superclass.

• Polymorphism: Objects of different classes can be treated as objects of a common superclass. Example:...read more

Normalization in SQL is the process of organizing data in a database to reduce redundancy and improve data integrity.

• Normalization is a technique used to eliminate redundant data and ensure data integrity.

• It involves breaking down a table into smaller tables and defining relationships between them.

• There are different normal forms such as 1NF, 2NF, 3NF, and BCNF.

• For example, in a database of students and courses, instead of storing student details in the course table, a separa...read more

Procedures do not return a value, while functions return a value.

• Procedures are used to perform an action, while functions are used to calculate and return a value.

• Functions have a return type specified, while procedures do not.

• Example: Procedure to display a message on the screen vs Function to calculate the sum of two numbers.

Class names for a chess game using OOP concepts include pieces, board, and game logic components.

• ChessBoard: Represents the chessboard with an 8x8 grid.

• ChessPiece: Base class for all chess pieces (e.g., Pawn, Rook, Knight).

• Pawn: Inherits from ChessPiece, defines movement and capture rules.

• Rook: Inherits from ChessPiece, defines vertical and horizontal movement.

• Game: Manages the game state, player turns, and rules enforcement.

Code to reverse a string

• Create an empty string variable to store the reversed string

• Loop through the original string from the end to the beginning

• Append each character to the empty string variable

• Return the reversed string

Schema for many to many relationship

• Create a junction table to connect the two entities

• Each record in the junction table represents a relationship between the two entities

• Both entities have a many-to-many relationship with each other

Code for Fibonacci series

• Declare two variables to store the first two numbers of the series

• Use a loop to generate the next numbers in the series by adding the previous two

• Print or store the generated numbers

A class is a blueprint for creating objects, while an object is an instance of a class.

• A class defines the properties and behaviors of objects.

• An object is created based on a class, and can have its own unique values for the properties defined in the class.

• Example: Class 'Car' may have properties like 'color' and 'model', while an object of class 'Car' could be 'red Ferrari'.

Datatype is a classification of data which tells the compiler or interpreter how the programmer intends to use the data.

• Datatypes specify the type of data that a variable can hold.

• Examples include int (integer), string (text), bool (boolean), etc.

• Different programming languages have different datatypes and rules for their usage.

An array is a collection of similar data types stored in contiguous memory locations.

• Arrays can be of any data type, including integers, floats, and objects.

• Arrays are indexed starting from 0.

• Arrays can be multidimensional, such as a 2D array.

• Arrays can be dynamically resized using methods like Append or Resize.

• Example: string[] names = {"John", "Jane", "Bob"};

Object-Oriented Programming (OOP) principles are crucial for .NET development, focusing on encapsulation, inheritance, and polymorphism.

• Encapsulation: Bundling data and methods that operate on the data, e.g., a class 'Car' with properties like 'speed' and methods like 'accelerate()'.

• Inheritance: Creating a new class based on an existing class, e.g., 'ElectricCar' inherits from 'Car', adding features like 'batteryCapacity'.

• Polymorphism: Allowing methods to do different things ...read more

C# is a language developed by Microsoft for the .NET framework, while Java is a language developed by Sun Microsystems.

• C# is primarily used for Windows development, while Java is platform-independent.

• C# uses properties and events, while Java uses getter and setter methods.

• C# has delegates and events for event handling, while Java uses interfaces and classes.

• C# has LINQ for querying data, while Java has streams and lambdas.

• C# has automatic memory management with garbage collec...read more

Object-oriented programming concepts like inheritance, encapsulation, polymorphism, and abstraction.

• Inheritance: Allows a class to inherit properties and behavior from another class.

• Encapsulation: Bundling data and methods that operate on the data into a single unit.

• Polymorphism: Ability to present the same interface for different data types.

• Abstraction: Hiding the complex implementation details and showing only the necessary features.