C# Basics

What is C#?

• C# is a programming language developed by Microsoft for building a wide range of enterprise applications that run on the .NET Framework.

• C# is a type of musical note

• C# is a term used in accounting for a specific type of transaction

• C# is a new brand of vitamin supplement

What are the basic data types in C#?

• The basic data types in C# include red, blue, green, yellow, purple, and orange.

• The basic data types in C# include apple, banana, orange, grape, watermelon, and pineapple.

• The basic data types in C# include cat, dog, bird, fish, rabbit, and hamster.

• The basic data types in C# include int, float, double, char, bool, and string.

Explain the difference between value types and reference types in C#.

• Value types are stored on the heap, while reference types are stored on the stack.

• Value types and reference types are stored in the same memory location.

• Value types and reference types are interchangeable in C#.

• In C#, value types are stored on the stack, while reference types are stored on the heap.

What is the use of 'using' statement in C#?

• The 'using' statement in C# is used to ensure that the resources are properly disposed of, even if an exception occurs.

• The 'using' statement in C# is used to define a loop.

• The 'using' statement in C# is used to create a new class instance.

• The 'using' statement in C# is used to declare a variable.

Explain the concept of inheritance in C#.

• Inheritance in C# only allows a class to inherit properties, not behaviors.

• Inheritance in C# is not supported and cannot be used.

• Inheritance in C# is used to create new instances of a class.

• In C#, inheritance allows a class to inherit properties and behaviors from another class. This promotes code reusability and helps in creating a hierarchy of classes.

What is the purpose of 'static' keyword in C#?

• To allow a method to be overridden in a derived class

• To declare a member that belongs to the type itself, rather than to any specific instance of the type.

• To make a variable accessible to all instances of a class

• To restrict access to a method within a class

What is the difference between 'const' and 'readonly' in C#?

• There is no difference between 'const' and 'readonly' in C#.

• The 'const' keyword is used to declare a constant value that can be changed at runtime, while the 'readonly' keyword is used to declare a constant value at compile time.

• The 'const' keyword is used for variables that can be modified, while the 'readonly' keyword is used for variables that cannot be modified.

• The 'const' keyword is used to declare a constant value at compile time, while the 'readonly' keyword is used to declare a constant value that can be assigned at runtime but cannot be changed after assignment.

Explain the concept of polymorphism in C#.

• Polymorphism in C# is used to create static methods

• Polymorphism in C# only works with a single data type

• Polymorphism in C# allows methods to be written to handle different data types and forms, providing flexibility and reusability in code.

• Polymorphism in C# is not related to method overloading

What are the different types of access modifiers in C#?

• Open, close, save, delete

• Red, blue, green, yellow

• Up, down, left, right

• The different types of access modifiers in C# are: public, private, protected, internal, protected internal, and private protected.

Explain the purpose of 'namespace' in C#.

• To handle user input

• To create user interfaces

• The purpose of 'namespace' in C# is to organize and provide a way to group related classes, interfaces, and other types.

• To perform mathematical calculations