Chapter 2 Key Terms

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Chapter 2 Key Terms
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AcceptButton Property
A form property

• Allows the use of Enter key to work in tandem
  with a button.
• Avoids mouse manipulation.

The Buttons on the form
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access key

• Applies to Buttons
• Ampersand () to the right of a text letter
  enables key stroke to replace mouse click.

Note the ampersand
Note the underline
does not have to be the first letter of text
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BorderStyle Property

• Frames certain visible objects such as the Label,
  TextBox, and PictureBox.
• Outlines otherwise invisible empty Labels.

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CancelButton Property

• Allows the use of Esc key to work in tandem with
  a button.
• Avoids mouse manipulation.

A form property
The Buttons on the form
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CheckBox
Text property

• User may select an option.
• CheckedChanged event procedure
• Checked and CheckState properties
• May have two or three states
• User may check any number of checkboxes

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Checked Property of the CheckBox

• False if CheckBox is unchecked, True if checked.

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Color constants

• Color class contains many colors.

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Component Tray

• Holds controls that have no visual at run time.

Appears in the document window below the design
form.
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Concatonation

• Joining strings of text.
• Ampersand operator ()
• Example
• passwordTextBox.text " is not valid."

space
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empty string

• Quotation mark set with no characters between.
  ("")
• Example
• nameLabel.Text ""
• Example results in empty Label.
• May be used instead of the Clear method.
• nameLabel.Clear( )

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Focus

• Buttons with the focus may be activated with the
  Enter key.
• TextBoxes with the focus contain an insertion
  point cursor.
• Focus may be shifted to another control by
  tabbing or by code.
• Applies only to certain controls
• Focus changes are actionable events.

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Focus Method

• Grabs the focus from another control
• Example code
• phoneNumberTextBox.Focus( )
• Example shifts the focus to the TextBox.
• Often used when a form is cleared to place the
  insertion cursor in the TextBox needed
  immediately by the user.

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ForeColor Property

• The color of text.
• Example
• warningLabel.ForeColor Color.Red
• Example causes the text in the label to be
  colored red.

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GroupBox

• Controls placed in a GroupBox can be moved as a
  group at design time or at run time. Within the
  group, relative position is preserved.
• RadioButtons placed in a GroupBox function
  cooperatively.

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Image Property

• Applies to controls that can hold images.

Click on ellipse to browse for images
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Line Continuation Character

• space followed by underscore
• use it to break long lines of code
• will not break words or identifiers

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PictureBox Control

• Specifically for holding an image.
• For portability, the image file should be copied
  into the .bin folder of the project.
• See the previous slide titled Image Property

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RadioButton

• Use when user may select only one of many.
• Place cooperative RadioButtons in a GroupBox.
• CheckedChange is an actionable event
• Initial state of Checked Property may be set at
  design time.

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Select Resource Dialog Box

• In Visual Studio 2005, the ellipse in Image
  Property box opens the Select Resource Dialog
  box.
• In Visual Studio 2003, the ellipse in Image
  Property box opens an Open Dialog box.

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Size Mode Property

• Applies to images.
• StretchImage makes image fill the PictureBox.

Size Modes
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StartPosition Property of Form

• Upper left is default position of the form at run
  time.

Start Position choices
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Tab Index Property

• Allows user to use Tab key to move focus in a
  predetermined order.
• After controls are in place, use ViewgtTab Order
  to set the order.
• Set TabStop to False to remove a control from the
  Tab order.
• Applies only to controls that can recieve the
  Focus
• Tab order must be turned off.

Change TabOrder by clicking on the control
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TextBox

• For typed user input.
• The initial value of the text property may be set
  at design time
• The text property may be changed by code at run
  time.
• When in Focus it holds the insertion cursor
• Entering user text is an actionable event.

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TextAlign Property

• Applies to controls that hold text
• Justifies the text.

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ToolTip

• Appears when mouse hovers on control.
• Provides terse explanation to the user.

Double click on icon in ToolBox to place icon
into component tray. Then edit the ToolTip
property for each control.
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Visible Property

• Controls visibility of a control.
• Set to False to hide a control.
• Set to True to show a control.
• May be changed at design time or at run time.

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With and End With (With block)

• Use in code when several properties of the same
  object are to be changed at the same time. May
  also include methods.
• Saves typing. Example