Chapter 1 Key Terms

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Chapter 1 Key Terms
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Assignment Statement

• The equal sign () is the assignment operator.
• Passes a value to a variable identified by name.
• Causes old value to be overwritten by new value.
• "present value is replaced by " whatever follows
  the equal sign.

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AutoCorrect

• Offers possible changes to misspelled words and
  common syntax errors.
• New with Visual Studio 2005
• Use your trial copy of Visual Studio to
  experience AutoCorrect
• Visual Studio 2003 provides automatic assistance
  but not automatic correction

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Camel Casing

• Naming convention.
• first letter of first word is lower case.
• first letter of all other words are upper case.
• Example

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Class

• Template or plan for an object.
• Contain definitions of properties, methods, and
  events.
• An object is an instance of a class.

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Clean Compile

• Upon execution, VB statements are converted to
  Microsoft Intermediate Language.
• A "Clean Compile" is a conversion without syntax
  errors.
• Program may still have logical errors and not
  work as planned.

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Context Menu

• Right click on subject of interest (like a
  control in the toolbox or a control on your
  form).
• Note that the context menu for a control in the
  toolbox is different from the context menu for
  the same tool on your form. (different context)

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Context Sensitive Help

• Hit F1 and an appropriate Help window pops up if
• pointer is on a control on the form
• pointer is on an IDE feature
• insertion point on a word of code.

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Control

• Any of the items in the Windows Forms tool box.
• They are classes of objects that help a user
  interact with the application.
• (the user is the person who will use the
  application that you create)

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Debug Time

• The mode assumed when debugging is paused.
• Errors
• Breakpoints

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Declaration Section

• The place in code where variables are declared.
  (Dim)
• Declarations may be found throughout the code but
  often found at the top of the page.
• Variable scope is related to declarations.
• Remarks are appropriately made above the
  declarations but may be placed anywhere in the
  code.

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Scope

• Where everybody knows your name.
• Where in the code particular identifiers are
  recognized and have value.
• More later.

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Design Time

• The mode of Visual Basic when you are designing
  the form or writing code.

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Document Window

• This is where you will design forms and write
  code.
• Notice that it is tabbed so you can easily switch
  between form design and code presentations.
• You can even bring up other files into the
  document window for reference.

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Express Edition

• Bill Gates accommodates several market targets
  with "custom" versions of Visual Basic.
• The matrix of features in found in Help Contents
  gt Introducing Visual Studio.NET gtVisual Studio
  .Net Editions.

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Event

• Action on the system taken by the user.
• Clicking on a mousekey.
• Pressing a key on the keyboard
• Loading a form
• Closing a form
• Causes an event procedure (subroutine) to run.
• Event procedures can be triggered by other
  objects in the program.

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Event Procedure

• Basically a block of Visual Basic code that runs
  when triggered by a system event.
• Must start with Private Sub and must end with End
  Sub.

Private Sub nextButton_Click(ByVal sender As
System.Object, ByVal e As _ System.EventArgs)
Handles nextButton.Click If
ItemNumber lt LastItemsAdded Then
ItemNumber ItemNumber 1
ClearRadioButtons()
ShowItem(ItemNumber) End If End Sub
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Form

• A Windows graphical user interface (GUI) object
• WSIWYG

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Form Designer

• Part of the Integrated Design Environment that
  allows you to design a Windows form.
• Allows you to place and resize visual objects on
  the form.
• Allows you to set the properties of objects on
  the form at design-time although properties may
  be changed at run-time.

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Graphical User Interface.

• A window containing controls that can be
  activated by the user.
• Also may provide a facility for obtaining user
  input data and providing output data.

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Handle

• (Has multiple meanings in VB)
• The markers for relocating or resizing objects

Selection Boarder
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Label

• A "control" object for displaying information.
• Not appropriate for input.(use TextBox instead.

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Logic Error

• When compilation is clean but the resulting
  application does not work as planned.
• For instance, your arithmetic may be flawed.

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Me

• The collection of the objects.
• It may refer to the form.
• Usually not required.

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Method

• An active capability of an object.
• For properties we think adjectives but for
  methods we think verbs.

dot
Property
Method
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Namespace

• Visual Basic uses namespaces to help the
  programmer find a particular object.
• More Later.

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Object Oriented Programming

• Basically, the user controls the flow of the
  program.

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Object

• Components of Visual Basic programs.
• An object is created from a class.
• Objects have specific events, properties, and
  methods defined by the class.

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Project File

• A text file, you can read it with Notepad
  Describes the project.
• Lists all of the files included in the project.

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Properties Window
Control
the properties
explanation
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Pseudocode

• English words that describe the action you want
  the application to take.
• It is not formalized, you make it up as you go
  along.
• It is used in the planning stages of the
  application design.

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Remarks

• Comments embedded in the code for explanation and
  clarification of the code.
• Helpful for later modification of the code.
• Header comments may contain
• The purpose of the program
• Name of programmer or team
• Date written or modified
• Begin each remark line with apostrophe.

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Run-time error (exception)

• Halts execution of the program.
• Impossible arithmetic
• Missing files
• Run can sometimes be rescued by code that
  responds to the condition.

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Snap Lines

• The Visual Basic 2003 form object has a
  SnapToGrid property which help in alignment.
• Snap lines do not exist in this version.

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Solution

• A Visual Basic application
• May contain one or more forms.

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Solution Explorer Window
Files in the project.