Mastering C# Coding Concepts

What is the purpose of the 'using' directive in C#?

• To simplify the use of types from namespaces in C#.

• To define access modifiers for classes in C#

• To create new namespaces in C#

• To declare variables in C#

Explain the difference between 'ref' and 'out' parameters.

• The 'ref' parameter modifies the original variable, while the 'out' parameter returns a new value.

• 'ref' parameters can only be used with classes, while 'out' can be used with any type.

• 'ref' parameters are for input only, whereas 'out' parameters are for output only.

• Both 'ref' and 'out' parameters are used to pass values by reference without modifying the original variable.

What is a delegate in C#?

• A delegate is a type of variable that stores data in C#.

• A delegate is a type that encapsulates a method reference in C#.

• A delegate is a built-in function in C# that performs calculations.

• A delegate is a class that manages memory allocation in C#.

How do you handle exceptions in C#?

• Use if-else statements to handle exceptions in C#.

• Log exceptions to a file without handling them.

• Ignore exceptions and continue execution.

• Use try-catch blocks to handle exceptions in C#.

What is the difference between an interface and an abstract class?

• An interface can have constructors, while an abstract class cannot.

• An interface cannot provide any implementation, while an abstract class can provide some implementation.

• An abstract class can implement multiple interfaces, while an interface cannot.

• An interface can contain fields, while an abstract class cannot.

What is the significance of the 'static' keyword?

• The 'static' keyword signifies that a member is private to the class and cannot be accessed externally.

• The 'static' keyword signifies that a member is associated with the class rather than any specific instance.

• The 'static' keyword indicates that a member can only be accessed through an instance.

• The 'static' keyword is used to define a variable that can change its value at runtime.

How do you implement inheritance in C#?

• class BaseClass { } class DerivedClass { }

• class BaseClass { } class DerivedClass : BaseClass { }

• class BaseClass extends DerivedClass {}

• class DerivedClass inherits BaseClass() {}

What are properties in C# and how are they used?

• Properties in C# are used to encapsulate data with get and set accessors, allowing controlled access to private fields.

• Properties in C# are similar to methods without parameters.

• Properties in C# cannot have any access modifiers.

• Properties in C# are only used for public fields.

Explain the concept of LINQ in C#.

• LINQ is a database management system for C#.

• LINQ is a programming language used for web development.

• LINQ is a feature in C# that allows for querying data in a consistent manner using a syntax similar to SQL.

• LINQ is a tool for designing user interfaces in C#.

What is the difference between value types and reference types?

• Reference types store data directly in memory.

• Value types can be null while reference types cannot.

• Value types are always larger than reference types.

• Value types hold the actual data; reference types hold a reference to the data.