GUI Controls and Properties Overview

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Questions and Answers

Which MessageBoxIcon enumeration represents a warning message?

Warning (correct)

Error

Information

Question

What is the return value from a dialog box labeled with 'Cancel'?

Abort

End

Cancel (correct)

Which MessageBoxIcon does NOT display any symbols?

None (correct)

Error

Information

Warning

What symbol does the Information MessageBoxIcon contain?

Lowercase letter i in a blue circle Signup and view all the answers

Which of the following is NOT a DialogResult enumeration?

Exit Signup and view all the answers

What is the primary function of controls in a graphical user interface (GUI)?

To act as interactive elements for users Signup and view all the answers

In which section does one typically manage a control's properties in a programming environment?

Properties window Signup and view all the answers

What is an appropriate three-letter lowercase prefix for a Button control?

btn Signup and view all the answers

Which of the following is NOT a recommended control prefix?

img Signup and view all the answers

What happens when you click the lightning bolt button in the Properties window?

You view the events associated with the control Signup and view all the answers

Which property organization method places the control's name at the top for convenience?

Alphabetical view Signup and view all the answers

What is the purpose of grouping properties in the Properties window?

To make it easier to find and manage properties Signup and view all the answers

Which control is identified by the prefix 'chk'?

CheckBox control Signup and view all the answers

What property of the button control sets its flat style appearance?

FlatStyle Signup and view all the answers

Which property determines how text is aligned within a TextBox control?

TextAlign Signup and view all the answers

What does the PasswordChar property in a TextBox control specify?

The character used to mask password input Signup and view all the answers

Which event is the default for a Button control?

Click Signup and view all the answers

What does the MaxLength property of a TextBox control denote?

The maximum number of characters allowed Signup and view all the answers

Which property of the FlatAppearance defines the border and colors in flat style?

FlatAppearance Signup and view all the answers

What functionality does the Focus() method provide for a TextBox control?

Gains input focus to the TextBox Signup and view all the answers

Which property allows you to set whether a TextBox control can be edited?

ReadOnly Signup and view all the answers

What property determines how a control is resized with its parent control?

Anchor Signup and view all the answers

Which property is used to set the text displayed by a control?

Text Signup and view all the answers

What does the 'Dock' property primarily influence in a control?

The way a control is docked to borders of the parent Signup and view all the answers

Which property would you adjust to change the control's background image?

BackgroundImage Signup and view all the answers

If you want to disable user interaction with a control, which property should you set to false?

Enabled Signup and view all the answers

Which property defines the position of the control within its parent container?

Location Signup and view all the answers

What does the 'ForeColor' property control in a control?

The foreground color of the control's text Signup and view all the answers

Which property would you modify to change the size of a control?

Size Signup and view all the answers

What is the primary purpose of the Focus() method in the context of user interface design?

To dynamically place the cursor in a specific control. Signup and view all the answers

What happens when the Focus() method is invoked on a TextBox control during the form load event?

The cursor is positioned in the TextBox for input. Signup and view all the answers

Which of the following parameters is NOT required by the MessageBox.Show function?

icon Signup and view all the answers

What is the return type of the MessageBox.Show function?

System.Windows.Forms.DialogResult Signup and view all the answers

What does the MessageBoxButtons enumeration specify?

The buttons displayed in the message box. Signup and view all the answers

Which of the following is a valid button combination in the MessageBoxButtons enumeration?

AbortRetryIgnore Signup and view all the answers

What is a likely outcome if the MessageBox.Show function is called with the parameters for the 'OKCancel' button setting?

A dialog will show with either an OK or Cancel action. Signup and view all the answers

Which buttons does the MessageBoxButtons.YesNoCancel enumeration include?

Yes, No, and Cancel Signup and view all the answers

Study Notes

Controls

Controls are graphical user interface (GUI) elements used in forms.
They act as visual widgets for user interaction.
Controls manipulate other objects in the backend, like database control and timer control.
You can change a control’s properties by editing them in the Properties window.

Properties Window

The Properties Window allows you to view a control's properties.
Properties can be organized by category or alphabetically.
Clicking the lightning bolt button lets you view events associated with a control.

Control Prefixes

It's recommended to use 3-letter lowercase prefixes for controls to improve code readability.
Examples include:
- Form: frm
- Button: btn OR cmd
- Label: lbl
- TextBox: txt
- CheckBox: chk
- RadioButton: opt
- List control: lst
- Combo Box: cmb
- Group Box: grp
- Panel: pnl
- Picture Box: pct

Common Control Properties

Name: Programmatic name of the control.
Anchor: Determines how a control is resized with its parent container.
BackColor: Background color of the control.
BackgroundImage: Background image displayed in the control.
Dock: Determines how a control is resized with its parent control.
Enabled: Indicates whether the control can respond to user interaction.
Font: Font of the displayed text of the control.
ForeColor: Foreground color of the control.
Size: Gets or sets the control's size (Height and Width).
Location: Represents the control's upper-left corner in container coordinates.
Text: Text associated with the control.
Visible: Indicates whether the control is shown or hidden.

Form

The Form is the main container for controls in an application.
An application can contain multiple forms.

Form Properties

FlatStyle: Controls the appearance of the button control in flat style.
FlatAppearance: Defines the appearance of the flat style border and colors.
Image: Sets the image displayed on the button control.
ImageAlign: Controls the alignment of the image on the button control.
TextImageRelation: Determines the position of text relative to the image.

Button Control

The default event for the Button control is Click.

Text Box

The TextBox control facilitates user input of text.

Text Box Properties

BorderStyle: Sets the border type.
MaxLength: Limits the maximum number of characters that can be entered.
Multiline: Indicates whether the textbox can accept multiple lines of text.
PasswordChar: Defines the character used to mask password characters visually.
ReadOnly: Makes the textbox read-only.
SelectedText: Provides access to the currently selected text.
TextAlign: Sets the text alignment within the textbox.

Text Changed Event

The default event for the TextBox control is TextChanged.

Focus() Method

Focus() method dynamically places the cursor in a control, allowing for immediate user interaction.
It is commonly used with the TextBox control.

MessageBox.Show Function

Displays a message box with customizable text, caption, buttons, and icons.

Parameters

text: Text to be displayed in the message box.
caption: Text to be displayed in the message box's title bar.
buttons: Specifies which buttons to display.
icon: Sets the icon to display in the message box.

Return Value

One of the DialogResult values, indicating the user's choice.

MessageBoxButtons Enumeration

Defines the available buttons to display for the MessageBox.Show function.

MessageBoxIcon Enumeration

Defines the available icons to display in the message box.

DialogResult Enumeration

Defines the possible return values from a MessageBox.Show function.

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Description

This quiz covers the key concepts of graphical user interface (GUI) controls, their properties, and recommended naming conventions. Learn about the functionality of controls, the usage of the Properties Window, and common properties associated with different control types. Test your knowledge about creating user-friendly interfaces!