John Snape

John Snape

Declaring Variables

Slide Duration:

Table of Contents

Section 1: Introduction
Introduction Hello World

46m 9s

Declaring Variables

50m 5s

Accepting Input

14m 11s

Operators, Expressions & Statements

35m 5s

Program Flow Control

36m 35s

Iterations & Looping

19m 4s

Working with Strings

49m 40s

Formatting Strings for Output

23m 15s

Helper Methods

23m 57s

Enumerations & Structures

17m 26s

Commenting & Documenting Code

6m 46s

Arrays, Stacks, Queues & Dictionaries

34m 16s

Generic Lists & Collections

16m 30s

Variable Scope

9m 6s

Reading & Writing Files

23m 10s

Dates & Times

14m 37s

Random Numbers


Handling Exceptions

22m 19s

The My Namespace

18m 49s

Environment Variables

8m 17s

Command Line Arguments

13m 4s

The CD Inventory Program So Far

31m 57s

Section 2: Object Oriented Programming
Introduction to Object Oriented Programming

56m 56s

Understanding & Creating Classes

33m 17s

Understanding Interfaces & Abstract Classes

18m 22s

Static vs. Instance Members

12m 45s

Understanding Inheritance

34m 55s

Understanding Polymorphism

13m 39s

Understanding Delegates

26m 9s

Reading & Understanding Code

37m 23s

Creating a Data Type

40m 42s

Unified Modeling Language & Class Diagrams

22m 24s

Upgraded CD Inventory Program

22m 15s

Section 3: GUI Programming
Introduction to GUI Programming

38m 58s

All About Forms

43m 36s

Handling Form Events


Informational Controls

30m 36s

Command Controls

38m 6s

Grouping Controls

1h 9m 59s

Text Editing Controls

35m 23s

List Selection Controls

42m 23s

Setting Options Controls

25m 58s

Dialog Controls

24m 41s

Graphic Display Controls

32m 45s

Date Setting Controls

18m 29s

Other Controls

13m 28s

Using the Clipboard

9m 31s

Sending Email

22m 30s

Some Sample Programs, Part 1

23m 2s

Some Sample Programs, Part 2

14m 9s

InputBox & Message Box

11m 4s

CD Inventory Program Upgraded with Forms

14m 44s

Section 4: 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

15m 7s

Using Databound Controls

17m 29s

CD Inventory Program Updated with a Database

15m 29s

Section 5: Conclusion
Where to Go from Here

17m 50s

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Lecture Comments (4)

1 answer

Last reply by: John Snape
Wed Dec 17, 2014 6:47 PM

Post by joseph pulliam on November 15, 2014

I have a question. When writing in Visual Studio Express 2012? There is no console. I am trying to figure out how to write a program for determining price per pounds with weight in ounces and pounds.

1 answer

Last reply by: John Snape
Mon Jul 28, 2014 2:19 PM

Post by Jean Uwumuremyi on July 26, 2014

Anybody else having problems opening the exercise files?

Declaring Variables

  • Dim stands for Dimension, you are telling VB how big of space to set aside for your variable (the dimensions of the variable space)
  • Value types hold their data directly
  • Reference types only hold a pointer to the actual data somewhere else in memory
  • All built-in numeric types are value types
  • Use a data type with enough precision for the work you need to do
  • {Enter Data Type Information}
  • {Enter Variable Naming Information}
  • Numeric variables default to 0 (zero)
  • String variable default to an empty string
  • Objects are initialized to Nothing (null)
  • Constants never change during the program execution
  • Constants can be any data type
  • Usually all uppercase so they are easily seen when scanning code
  • Implicit conversions are always allowed for widening conversions (where the source data type is less precise than the destination data type)
  • Explicit conversions are for narrowing conversions
  • Null means "never entered"
  • Use ? after the variable name in the Dimension statement
  • Boolean is a "Yes or No"/"True or False" type variable
  • False always converts to/from zero
  • Although discouraged, you can use a reserved word for a variable name by always surrounding it with brackets [ ]

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