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Programming in C#: Exam 70-483 (MCSD) Guide
Programming in C#: Exam 70-483 (MCSD) Guide

Programming in C#: Exam 70-483 (MCSD) Guide: Learn basic to advanced concepts of C#, including C# 8, to pass Microsoft MCSD 70-483 exam

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Programming in C#: Exam 70-483 (MCSD) Guide

Understanding Classes, Structures, and Interfaces

In Chapter 1, Learning the Basics of C#, we looked at an overview of the very basic components of a C# application. All classes in a C# application are composed of attributes and methods. Using namespaces and assemblies, we can bundle related classes together.

To maintain structure and to reduce complexity, it's essential that only the required classes/functionality are exposed outside the scope of a class. In a C# program, this is achieved via access modifiers. While defining the attributes present in a class, we also need to be clear about the different data types of variables available in C#.

Using a code implementation of struct and class, we will look at how data and reference type variables differ in implementation and behavior during program execution. We will also be looking at some good practices that we can follow...

Technical requirements

Access modifiers

All classes, along with their respective attributes and functions, have an access modifier associated with them. An access modifier basically indicates how the respective element will be accessed in the application, both in its own assembly as well as in other assemblies. Collectively, attributes and functions in an application are referred to as class members.

In C#, a class and its class members can acquire the following access modifiers:

  • Public: A class or a class member declared as public can be accessed by all classes in the same assembly as well as by classes in different assemblies present in the application.
  • Private: A class member declared as private can be accessed only in the same class but not outside it.
  • Protected: A class or a class member declared as protected can be accessed inside the class or by classes that inherit from the respective class...

Data types in C#

In C#, a variable can acquire one of the following types:

  • A value type
  • A reference type

C# differentiates between these two types in terms of how these values are saved and maintained in the Global Assembly Cache (GAC) during the program execution. Value type variables are saved in the stack, while reference type variables are saved in a managed heap data structure.

There are other pointer types that allow us to access value in the memory location of a variable. In Chapter 8, Creating and Using of Types in C#, we will explore those data types in detail. For now, let's look at these two data types and explore them in detail.

Value type variables

In value types, the variables contain the data or the...

Structs versus classes

In the first chapter, we created a basic Hello World program. In this topic, we will extend that program and use it to implement a struct and a class. While doing so, we will analyze the difference between the implementation and use of reference and value type variables. As you are already aware by now, a struct is a value type variable and a class is a reference type variable:

  1. Open the Console project created in Chapter 1, Learning the Basic Structure of C#, and declare a CoordinatePoint class with just two member attributes of x and y coordinates. Also create two constructors – one without any parameters and one with two parameters. Please refer to the following code implementation for this:
class CoordinatePoint
{
public float xCoordinate;
public float yCoordinate;
public CoordinatePoint()
{
}
public CoordinatePoint(float x,...

Interfaces and inheritance

An interface is a collection of properties, methods, and events with just a declaration and no definition. We use them in programming to group together a set of functionalities that must be implemented in classes that, theoretically, are of the same basic type.

Let's look at an example of a car. In a real-world scenario, any implementation of the Car class must implement certain common basic features such as driving, stopping, and accelerating. Along with those, any object that is classified as a car will also have certain features specific to the make of the car, such as Honda or Nissan.

In the preceding example, an interface could help to promote code reuse and maintain structure across all types of Car. What we can do in this case is to declare Car as an interface that all car derivatives, such as Nissan or Honda must implement.

Similar to an...

Summary

The topics covered in this chapter are the basics of programming in the C# language. Using access modifiers, we can control access to different properties and methods in different modules of an application. While writing the code, a very common mistake that people make is to declare all the properties and methods as public. This is not the recommended way of programming in C#. We must logically evaluate the need for different access modifiers for each of the properties and methods present in a class.

Similarly, we should analyze the data types that we need to associate with each property used in the class. We must also analyze if we need a reference data type variable, or whether we are fine with a value type variable as they have a different implementation in the compiler memory and functionality. We should also utilize inheritance as it helps us to reuse code and structure...

Questions

  1. Which of the following attributes declared in the Car class is not a value type variable?
    1. public Decimal fuelCapacity;
    2. public Enum carColor;
    3. public String registrationNumber;
    4. public Int numberOfSeats
  2. Which of the following is not a reference type variable?
    1. Class
    2. String
    3. Struct
    4. Interface
  3. In C#, a child class can inherit from multiple parent classes. Is this statement correct?
    1. Yes
    2. No
  4. Which of the following statements about interfaces and classes is not correct?
    1. A class can implement multiple interfaces.
    2. An interface can have both function declarations and definitions.
    3. A struct data variable cannot inherit from another struct.
    4. In inheritance, if both the base class and the derived class have a function with the same name, we can use the base keyword to implicitly call the function of the base class.
  5. Which of the following statements about access modifiers is...

Answers

  1. public String registrationNumber;. String is a reference type variable. All others are value type variables.
  2. Struct is a value type variable unlike all others which are reference type variables.
  3. No, in C# we cannot have multiple inheritance. A class can only inherit from one base class.
  4. In C#, an interface must only have function declarations and not definitions. All other statements are correct.
  5. If a member variable is declared as protected, it can only be accessed in the classes that inherit from its base parent class.
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Key benefits

  • Prepare for the certification using step-by-step examples, and mock tests with standard solutions
  • Understand the concepts of data security for secure programming with C#
  • Learn to scale and optimize your application codebase using best practices and patterns

Description

Programming in C# is a certification from Microsoft that measures the ability of developers to use the power of C# in decision making and creating business logic. This book is a certification guide that equips you with the skills that you need to crack this exam and promote your problem-solving acumen with C#. The book has been designed as preparation material for the Microsoft specialization exam in C#. It contains examples spanning the main focus areas of the certification exam, such as debugging and securing applications, and managing an application's code base, among others. This book will be full of scenarios that demand decision-making skills and require a thorough knowledge of C# concepts. You will learn how to develop business logic for your application types in C#. This book is exam-oriented, considering all the patterns for Microsoft certifications and practical solutions to challenges from Microsoft-certified authors. By the time you've finished this book, you will have had sufficient practice solving real-world application development problems with C# and will be able to carry your newly-learned skills to crack the Microsoft certification exam to level up your career.

Who is this book for?

The book is intended to the aspirants of Microsoft certifications and C# developers wanting to become a Microsoft specialist. The book does not require the knowledge of C#, basic knowledge of software development concepts will be beneficial

What you will learn

  • Explore multi-threading and asynchronous programming in C#
  • Create event handlers for effective exception handling
  • Use LINQ queries for data serialization and deserialization
  • Manage filesystems and understand I/O operations
  • Test, troubleshoot, and debug your C# programs
  • Understand the objectives of Exam 70-483 and apply common solutions
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Table of Contents

21 Chapters
Learning the Basics of C# Chevron down icon Chevron up icon
Understanding Classes, Structures, and Interfaces Chevron down icon Chevron up icon
Understanding Object-Oriented Programming Chevron down icon Chevron up icon
Implementing Program Flow Chevron down icon Chevron up icon
Creating and Implementing Events and Callbacks Chevron down icon Chevron up icon
Managing and Implementing Multithreading Chevron down icon Chevron up icon
Implementing Exception Handling Chevron down icon Chevron up icon
Creating and Using Types in C# Chevron down icon Chevron up icon
Managing the Object Life Cycle Chevron down icon Chevron up icon
Find, Execute, and Create Types at Runtime Using Reflection Chevron down icon Chevron up icon
Validating Application Input Chevron down icon Chevron up icon
Performing Symmetric and Asymmetric Encryption Chevron down icon Chevron up icon
Managing Assemblies and Debugging Applications Chevron down icon Chevron up icon
Performing I/O Operations Chevron down icon Chevron up icon
Using LINQ Queries Chevron down icon Chevron up icon
Serialization, Deserialization, and Collections Chevron down icon Chevron up icon
Mock Test 1 Chevron down icon Chevron up icon
Mock Test 2 Chevron down icon Chevron up icon
Mock Test 3 Chevron down icon Chevron up icon
Assessments Chevron down icon Chevron up icon
Other Books You May Enjoy Chevron down icon Chevron up icon

Customer reviews

Rating distribution
Full star icon Full star icon Full star icon Empty star icon Empty star icon 3
(1 Ratings)
5 star 0%
4 star 0%
3 star 100%
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1 star 0%
Brian A. Lee Nov 24, 2020
Full star icon Full star icon Full star icon Empty star icon Empty star icon 3
I am not impressed with this book. There are a few chapters (ch. 5 & 6) were decent, but overall the rest of the book is meh. I found numerous errors in example code in the chapters and mock tests have ambiguous answer choices (some code choices do exactly same thing when I ran the code in LinqPad).Overall, some topics are explained well in good detail, while other topics/chapters are a best vague and at worse typos and erroneous.
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