L Cube Innovative Solutions Interview Questions and Answers

Singleton design pattern restricts the instantiation of a class to a single instance and provides global access to it.

• Used when only one instance of a class is required throughout the application

• Provides a global point of access to the instance

• Implemented using a private constructor, static method, and static variable

• Example: Logger class, Database connection class

C# LINQ queries for group and sum data from data table

• Use GroupBy() method to group data based on a specific column

• Use Sum() method to calculate the sum of a column

• Use Select() method to select the required columns

Solid design principles are a set of guidelines for writing maintainable and scalable code.

• Single Responsibility Principle (SRP) - each class should have only one responsibility

• Open/Closed Principle (OCP) - classes should be open for extension but closed for modification

• Liskov Substitution Principle (LSP) - subclasses should be able to replace their parent classes without affecting the program's correctness

• Interface Se...read more