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John Snape

John Snape

Understanding & Creating Classes

Slide Duration:

Table of Contents

I. Introduction
Introduction Hello World

15m 5s

Declaring Variables

47m 26s

Accepting Input

13m 17s

Operators, Expressions and Statements

40m 8s

Program Flow Control

31m 44s

Iterations & Looping

24m 43s

Working with Strings

53m 6s

Formatting Strings for Output

16m 24s

Helper Methods

28m 40s

Enumerations & Structures

8m 39s

Commenting & Documenting Code

8m 48s

Arrays, Stacks, Queues & Dictionaries

41m 29s

Generic Lists & Collections

14m 24s

Variable Scope

10m 38s

Reading & Writing Files

25m 10s

Dates & Times

12m 22s

Random Numbers

5m 29s

Handling Exceptions

14m 45s

Environment Variables

8m 21s

Command Line Arguments

10m 43s

The CD Inventory Program So Far

34m 16s

II. Object Oriented Programming
Introduction to Object Oriented Programming

1h 2m 20s

Understanding & Creating Classes

26m 6s

Understanding Interfaces & Abstract Classes

20m 12s

Static vs. Instance Members

16m 24s

Understanding Inheritance

32m 59s

Understanding Polymorphism

14m 58s

Understanding Delegates

22m

Reading & Understanding Code

35m 49s

Creating a Data Type

29m 21s

Unified Modeling Language & Class Diagrams

23m 5s

The CD Inventory Program Upgraded with Classes

20m 33s

III. GUI Programming
Introduction to GUI Programming

39m 19s

All About Forms

40m 7s

Handling Form Events

15m 22s

Informational Controls

27m 44s

Command Controls

36m 23s

Grouping Controls

26m 44s

Text Editing Controls

25m 7s

List Selection Controls

37m 45s

Setting Options Controls

21m 20s

Dialog Controls

22m 21s

Graphic Display Controls

35m 37s

Date Setting Controls

15m 53s

Other Controls

17m 33s

Using the Clipboard

7m 28s

Sending Email

25m 16s

Some Sample Programs

38m 31s

Our CD Inventory Program Upgraded with Forms

15m 16s

IV. Databases
Introduction to Databases

34m 7s

SQL Server Management Studio & Northwind Database

8m 11s

SELECT Statement

31m 24s

UPDATE & DELETE Statements

16m 56s

INSERT Statement

11m 48s

Creating a Database from Scratch

44m 54s

Querying Lists with LINQ

20m 42s

Using Databound Controls

14m 22s

Our CD Inventory Program Upgraded with a Database

10m 50s

V. Conclusion
Where to Go from Here

19m 48s

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For more information, please see full course syllabus of C#
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Lecture Comments (6)

0 answers

Post by Carl Scaglione on September 20, 2017

The C# code that was in the Exercise Files was the namespace InheritableClass.  It was topically related, but no where near the same code that was delivered in the lecture. Was this intentional?  Looks like interesting code and advanced for this lesson.  Look forward to your response.

0 answers

Post by Carl Scaglione on September 20, 2017

Followed along with your video and received unrecoverable compiler errors.  In your code, they did not appear and my code was almost identical.  When creating the methods 'public void Account() {}', public long Account(string name){ some code}, and public void Account (long ID, string name){}, I received the CS0542 code error:  'Account' member names cannot be the same as their enclosing type.  I did change the name of the methods to 'myAccount' and the problem went away, but the objective of the lesson was to show constructors which are supposed to have the same name as the class.  I am using Windows 10 and Visual Studio 2017.  This is new to me.  Do you have any thoughts?  I have followed your lectures and this is the first time that such an unresolvable error occurred.  

1 answer

Last reply by: John Snape
Sun Apr 20, 2014 3:19 AM

Post by Thuy Nguyen on April 20, 2014

I learned on Lynda.com that the return type is not part of the method signature, because C# won't know which method you want just based on the return type.  But...somehow in this lecture you can have two constructors with the same parameter list and different return types...I don't know what is the right about overloaded methods anymore now.  

Even if you can have two methods with the same parameter type but with different return values, would it be good practice to?  

1 answer

Last reply by: John Snape
Sun Apr 20, 2014 3:09 AM

Post by Thuy Nguyen on April 20, 2014

Hi, in Java, I learned that the constructor doesn't return anything, not even void.  Why would a constructor return anything in C# if it's job is to create a new object?

Understanding & Creating Classes

  • The main parts of Classes are:
    • Fields
    • Properties
    • Constructors/Destructors
    • Events
    • Methods
  • Fields are hidden from the user of your classes, and can’t be directly modified
  • Properties are directly modifiable by your class’s users
    • They can be ReadOnly or WriteOnly
    • If you only create properties without fields backing them, Visual Basic will create fields for you, but you won’t be able to access them yourself
  • Constructors create instances of your classes, Destructors destroy instances
  • Events aren’t called directly, they are called to handle specific things that happen to your class
  • Methods are called directly to change or work with data from your class
  • You can include a Class in another project by copying it to the new project, or you can create a .dll file and reference it from another project
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