10+ Walplast Products Interview Questions and Answers

Conflict arises and implementing class must explicitly implement the method from both interfaces.

• Conflict arises when implementing class implements both interfaces

• Implementing class must explicitly implement the method from both interfaces

• Example: Interface A and Interface B both have a method named 'foo', implementing class must provide implementation for 'foo' from both interfaces

Sealed class is a class that cannot be inherited. It is used to prevent derivation of a class.

• Sealed classes are declared using the 'sealed' keyword.

• They are often used when a class is not intended to be inherited or overridden.

• Sealed classes can have private constructors to prevent instantiation.

• Example: 'sealed class MyClass {}'

Singleton Design Pattern ensures a class has only one instance and provides a global point of access to it.

• Ensures a class has only one instance

• Provides a global point of access to that instance

• Commonly used in scenarios where only one instance of a class is needed, such as database connections or logging

const and Readonly are used in C# to declare constant values, but Readonly can be assigned a value at runtime.

• const keyword is used to declare constants at compile time

• const values cannot be changed once assigned

• Readonly keyword is used to declare constants whose value can be assigned at runtime

• Readonly values can only be assigned in the constructor or at the time of declaration

The 'out' keyword is used in C# to pass arguments by reference, allowing the method to modify the value of the argument.

• Used to pass arguments by reference in C#

• Allows the method to modify the value of the argument

• Must be assigned a value inside the method before returning

Managed code is code that is executed by the Common Language Runtime (CLR) in .NET framework.

• Managed code is written in high-level languages like C#, VB.NET, etc.

• It is compiled into Intermediate Language (IL) which is then executed by the CLR.

• CLR provides services like memory management, security, exception handling, etc. for managed code.

• Managed code runs in a managed environment where the runtime takes care of various aspects of execution.

Constructor chaining is the process of calling one constructor from another constructor within the same class.

• Allows for reusing code and avoiding duplication

• Can be achieved using 'this()' keyword in C#

• Example: public MyClass() : this(0) { }

Start_up class is a class in .NET framework used to configure services and middleware for an application.

• Start_up class is used to configure services like dependency injection, middleware, and routing in an ASP.NET Core application.

• It contains methods like ConfigureServices() to add services to the dependency injection container and Configure() to set up middleware pipeline.

• Start_up class is typically found in the root folder of the project and is named Startup.cs.

• Example: pu...read more

Generics in programming allow for the creation of classes, interfaces, and methods that operate on data types without specifying the actual type at compile time.

• Generics provide type safety by allowing the use of parameterized types.

• They enable code reusability by writing generic algorithms that work with different data types.

• Example: List in C# allows for creating a list of any data type T.

Enums are a set of named constants representing a group of related values.

• Enums in C# are value types that allow you to define a set of named constants.

• Enums can be used to improve code readability and maintainability by giving meaningful names to integral values.

• Example: enum Days { Monday, Tuesday, Wednesday, Thursday, Friday }