Fundamental Concepts of C# Programming
20 Questions
1 Views

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

What is a class in C#?

  • A blueprint for creating objects with fields, properties, methods, and constructors (correct)
  • A data structure for organizing related data
  • A set of predefined functions for performing specific tasks
  • A collection of methods for manipulating objects

    • What does inheritance allow in C#?

  • It allows a base class to inherit all properties and methods from the derived class
  • It allows a derived class to inherit only properties from the base class
  • It allows a base class to access private members of the derived class
  • It allows a derived class to inherit all properties and methods from the base class (correct)

    • What is the purpose of a constructor in a C# class?

  • To define the fields and properties of the class
  • To initialize the fields and properties of the class (correct)
  • To modify the behavior of methods in the class
  • To create an instance of the class

    • Which of the following is NOT a part of a C# class?

    <p>Indexes</p> Signup and view all the answers

    In C#, what does a base class provide to a derived class through inheritance?

    <p>All properties, methods, and constructors</p> Signup and view all the answers

    In the given C# code, what does the 'virtual' keyword indicate in the Display method of the Shape class?

    <p>It indicates that the method can be overridden in derived classes.</p> Signup and view all the answers

    In the given C# code, what happens if the 'x / y' operation in the try block of the Main method throws an exception?

    <p>The 'catch' block is executed to handle the exception.</p> Signup and view all the answers

    What happens when an instance of Shape is created and assigned a reference to a Circle object in the given C# code?

    <p>The methods from <code>Shape</code> class will be executed based on the reference type, but if overridden, the methods from <code>Circle</code> class will be executed based on the object type.</p> Signup and view all the answers

    What is the purpose of using the finally block in the exception handling example provided in the C# code?

    <p>To execute code regardless of whether an exception is thrown or not.</p> Signup and view all the answers

    What does LINQ (Language Integrated Query) allow developers to do in C#?

    <p>Write database-style queries in their code for any collection that implements the IEnumerable interface.</p> Signup and view all the answers

    Match the following HTML elements with their respective purpose:

    <nav> = Create a navigation menu <article> = Define a blog post <table> = Display data in a tabular format <form> = Capture user input Signup and view all the answers

    Match the following HTML table elements with their function:

    <tr> = Define a row <th> = Define a table header cell <td> = Define a table data cell <table> = Create a table Signup and view all the answers

    Match the following HTML5 semantic elements with their significance:

    <header> = Provide introductory content or navigation links <footer> = Define the footer of a webpage <main> = Contain the central content of the webpage <section> = Group related content together Signup and view all the answers

    Match the following HTML form elements with their usage:

    <p>Username: = Capture the user's username Password: = Capture the user's password <input> = Create an input field</p> <form> = Wrap form controls Signup and view all the answers

    Match the following HTML table header cells with their purpose:

    <p>Header 1 = First column header in a table Header 2 = Second column header in a table Row 1, Column 1 = Header cell for first row and first column Row 1, Column 2 = Header cell for first row and second column</p> Signup and view all the answers

    Match the following HTML tags with their descriptions:

    <html> = The root element of an HTML document <head> = Contains information about the document, such as the title and any scripts or stylesheets <p> = Defines a paragraph <a> = Defines a hyperlink Signup and view all the answers

    Match the following HTML attributes with their purposes:

    <p>src = Specifies the source of the image alt = Provides an alternative text description of the image href = Specifies the URL of the link type = Specifies the type of input in a form</p> Signup and view all the answers

    Match the following HTML elements with their functions:

    <form> = Used to collect user input <h1>, <h2>,..., <h6> = Define headings of different levels <body> = Contains the content of the document that is visible to the user &lt;title> = Contains the title of the document Signup and view all the answers

    Match the following HTML terminology with their meanings:

    <p>Tags = Used to define and format elements on a webpage Elements = Used to structure and format content Attributes = Provide additional information about an element Markup Language = Standard language used to create web pages</p> Signup and view all the answers

    Match the following aspects of HTML with their descriptions:

    <p>Tables = Part of various aspects of HTML to be explored in this article Semantic Elements = Part of various aspects of HTML to be explored in this article Forms = Part of various aspects of HTML to be explored in this article Attributes = Part of various aspects of HTML to be explored in this article</p> Signup and view all the answers

    Study Notes

    Introduction to C#

    C# is a modern, object-oriented programming language developed by Microsoft that runs on the .NET Framework. It is widely used for developing Windows desktop applications, games, web applications, and mobile applications. In this article, we will explore some of the fundamental concepts of C#, including classes, inheritance, polymorphism, exception handling, LINQ, and LINQ to SQL.

    Classes

    A class in C# is a blueprint for creating objects, which define a new type of object. Classes consist of fields (variables), properties, methods, and constructors. Here is an example of a simple C# class:

    using System;

public class Person
{
    // Fields
    public string name;
    public int age;

    // Constructor
    public Person(string n, int a)
    {
        name = n;
        age = a;
    }

    // Method
    public void Display()
    {
        Console.WriteLine("Name: {0}", name);
        Console.WriteLine("Age: {0}", age);
    }
}

    In this example, we have a Person class with two fields (name and age), a constructor that initializes these fields, and a Display method that prints the person's name and age.

    Inheritance

    Inheritance is a fundamental concept in object-oriented programming that allows a new class to be based on an existing class, inheriting all of its properties and methods. In C#, the existing class is called the base class, and the new class is called the derived class. Here is an example of inheritance in C#:

    using System;

public class Animal
{
    public string name;
    public int age;

    public void Display()
    {
        Console.WriteLine("Name: {0}", name);
        Console.WriteLine("Age: {0}", age);
    }
}

public class Dog : Animal
{
    public string breed;

    public void DisplayBreed()
    {
        Console.WriteLine("Breed: {0}", breed);
    }
}

public class Program
{
    public static void Main()
    {
        Dog dog = new Dog();
        dog.name = "Fido";
        dog.age = 3;
        dog.breed = "Labrador";
        dog.Display();
        dog.DisplayBreed();
    }
}

    In this example, we have a base class Animal with two fields (name and age) and a Display method. We also have a derived class Dog that inherits from Animal and adds a new field (breed) and a new method (DisplayBreed).

    Polymorphism

    Polymorphism is the ability of an object to take on many forms. In C#, polymorphism is achieved through methods and operators. Here is an example of polymorphism in C#:

    using System;

public class Shape
{
    public virtual void Display()
    {
        Console.WriteLine("This is a shape.");
    }
}

public class Circle : Shape
{
    public int radius;

    public override void Display()
    {
        Console.WriteLine("This is a circle with a radius of {0}.", radius);
    }
}

public class Program
{
    public static void Main()
    {
        Shape shape = new Circle();
        shape.Display();
    }
}

    In this example, we have a base class Shape with a Display method. We also have a derived class Circle that overrides the Display method to provide specific information for circles.

    Exception Handling

    Exception handling is the process of anticipating, detecting, and recovering from exceptional conditions. In C#, exception handling is performed using the try, catch, and finally keywords. Here is an example of exception handling in C#:

    using System;

public class Program
{
    public static void Main()
    {
        try
        {
            int x = 5;
            int y = 0;
            int z = x / y;
            Console.WriteLine("Result: {0}", z);
        }
        catch (DivideByZeroException ex)
        {
            Console.WriteLine("Error: {0}", ex.Message);
        }
        finally
        {
            Console.WriteLine("Finally block executed.");
        }
    }
}

    In this example, we attempt to divide 5 by 0, which will throw a DivideByZeroException. We use a try block to wrap the potentially exception-throwing code, a catch block to handle the exception, and a finally block to execute cleanup code.

    LINQ

    LINQ (Language Integrated Query) is a feature of C# that allows developers to write database-style queries in their code. LINQ queries can be used to query any collection that implements the IEnumerable interface, including arrays and lists. Here is an example of a LINQ query in C#:

    using System;
using System.Linq;
using System.Collections.Generic;

public class Program
{
    public static void Main()
    {
        List<int> numbers = new List<int> { 1, 2, 3, 4, 5 };
        var query = from num in numbers
                    where num % 2 == 0
                    select num;

        foreach (int num in query)
        {
            Console.WriteLine(num);
        }
    }
}

    In this example, we have a list of integers and use a LINQ query to filter out the even numbers.

    LINQ to SQL

    LINQ to SQL is an extension of LINQ that allows developers to query and manipulate data stored in SQL Server databases. Here is an example of LINQ to SQL in C#:

    using System;
using System.Data.Linq

    Studying That Suits You

    Use AI to generate personalized quizzes and flashcards to suit your learning preferences.

    Quiz Team

    Description

    Explore the fundamental concepts of C# programming, including classes, inheritance, polymorphism, exception handling, LINQ, and LINQ to SQL through examples and explanations. Learn about creating objects, overriding methods, handling exceptions, querying collections, and manipulating SQL Server databases.

    More Like This

    Use Quizgecko on...
    Browser
    Open
    Browser
    Browser