Building an Application in the Visual Basic .NET Environment

1
Chapter 3

• Building an Application in the Visual Basic .NET
  Environment

2
Objectives

• Design a Visual Basic .NET application
• Start a new Visual Basic .NET project
• Change the size of a form
• Change the property values of a form
• Add controls to a form

3
Objectives

• Move and resize controls on a form
• Use the Label, TextBox, NumericUpDown, and Button
  controls
• Change the property values of controls
• Change the Name property to rename a control
• Write the code for a Click event procedure

4
Objectives

• Display line numbers in the code window
• Use control properties in a method
• Document code with a comment header and comment
  statements

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Program Development
7
Starting a New Project

• Start Visual Basic .NET. When the Start Page
  displays, click the New Project button on the
  Start Page
• Click the More button
• Click the Create directory for Solution check
  box. Double-click the text, WindowsApplication1,
  in the Name box. Type State Tax Computation in
  the Name box

8
Starting a New Project

• Click the Browse button. If necessary, select 3½
  Floppy (A) in the Look in box. Double-click
  Chapter3 in the Look in list
• Click the Open button
• Click the OK button and, if necessary, click the
  Maximize button on the Visual Basic .NET title
  bar to maximize the window

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Changing the Size of a Form

• Click the Form1 form in the main work area.
  Point to the center sizing handle on the forms
  right border
• Drag the forms right border to the left to
  decrease the form width by approximately one-half
  inch
• Point to the center sizing handle on the forms
  bottom border and then drag the forms bottom
  border up to decrease the form height
  approximately one-half inch

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Using the Property Window

• Object Box
• Property List
• Toolbar
• Categorized button
• Alphabetic button
• Properties button
• Property Pages button
• Description Pane

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Changing StartPosition, Title, and
FormBorderStyle Property Values
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Changing StartPosition, Title, and
FormBorderStyle Property Values

• Click the title bar of the Form1 form to select
  the form. Scroll the Properties list until the
  FormBorderStyle property displays
• Click the Sizable value next to the
  FormBorderStyle property. Click the
  FormBorderStyle box arrow next to the value,
  Sizable

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Changing StartPosition, Title, and
FormBorderStyle Property Values

• Click Fixed Dialog in the FormBorderStyle
  property values list
• Scroll down to the Text property, and
  double-click the Form1 value next to the Text
  property
• Type State Tax Computation as the Text property
  and press the ENTER key

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Changing StartPosition, Title, and
FormBorderStyle Property Values

• Scroll the properties list to the StartPosition
  property and click the WindowsDefaultLocation
  value next to the StartPosition property
• Click the StartPosition box arrow and select
  CenterScreen in the values list

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Changing Additional Form Property Values
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Adding Label Controls to a Form

• Click the Windows Forms tab in the Toolbox
  window, and point to the Label button
• Click the Label button and point to the
  upper-left corner of the form
• Drag the mouse pointer down and to the right to
  size the Label control
• Release the mouse button
• Click any blank area on the Form1 form

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Adding TextBox Controls to a Form

• Point to the TextBox button in the Toolbox window
• Drag the TextBox button to the right without
  releasing the mouse button
• Release the mouse button
• Add a second TextBox control to the form, along
  with 2 more labels

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Adding a NumericUpDown Control to a Form

• Click the down scroll arrow in the Toolbox window
  until the NumericUpDown button displays on the
  Windows Forms sheet
• Drag the NumericUpDown button to the right of the
  Form1 form
• Click any blank area on the Form1 form

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Adding Button Controls to a Form

• Double-click the Button button in the Toolbox
  window
• Add a second Button control to the form
• Click and drag the controls to position them as
  shown on the following slide

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Changing Properties of Controls

• Single-click the control for which you wish to
  change the properties
• In the Property window, scroll down to the
  property you wish to change and type or select
  the property value next to the property name
• Set the properties of your controls according to
  the tables on the following slides

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Changing the Name Property of Controls

• Name property
• Naming conventions

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TextBox and NumericUpDown Control Methods

• Event-driven program
• Events are messages sent to an object
• Click event
• Event procedures, triggered by events, are groups
  of code statements
• Code statements are instructions to the computer
  written at design time for the computer to
  execute at run time

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Assignment Statements

• controlname.propertynamepropertyvalue

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Comment Statements
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Writing Code in the Code Window

• Intellisense anticipates your needs during coding
  and displays prompts to assist you in coding
• A syntax error is an error caused by code
  statements that violate one of the structure or
  syntax rules of the Visual Basic .NET language

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Showing Line Numbers and Writing Code for a
Comment Header and the btnCompute_Click Event
Procedure

• Select Options from the Tools menu on the menu
  bar and click the Text Editor folder in the
  Options dialog box
• Click the Basic folder below the Text Editor
  folder and click Line numbers in the Display area
• Click the OK button

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Showing Line Numbers and Writing Code for a
Comment Header and the btnCompute_Click Event
Procedure

• Double-click the Compute Tax button on the Form1
  form in the main work area
• Type the five comment header lines (excluding
  line numbers) as shown below

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Showing Line Numbers and Writing Code for a
Comment Header and the btnCompute_Click Event
Procedure

• On the blank line below the word, Private, type
  lines 142 and 143 of code, as shown below
• Click the Form1.vbDesign tab

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Writing Code for the btnReset_Click Event
Procedure

• Double-click the Reset button on the Form1 form
  in the main work area
• Enter the code below
• Click the Form1.vbDesign tab

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Saving and Testing the Application

• Click the Save All button on the Standard toolbar
• Click the Start button on the Visual Basic .NET
  Standard toolbar
• Click the Minimize button on the Visual Basic
  .NET title bar. Type 50000 in the Taxpayers
  income text box and then select the number 3 for
  the number of dependents
• Click the Computer Tax button

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Click the Close button on the applicationand
Maximize the Visual Basic .NET window
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Documenting the Application and Quitting Visual
Basic .NET

• Close the Output window. Click the
  Form1.vbDesign tab and use the PRINT SCREEN
  key, along with your knowledge from Chapter 2, to
  record the user interface design
• Click the Form1.vb tab. Click File on the menu
  bar and then click Page Setup

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Documenting the Application and Quitting Visual
Basic .NET

• Use the Print command on the File menu to print a
  record of the code of the State Tax Computation
  form
• Click the Visual Basic .NET Close button

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Summary

• Design a Visual Basic .NET application
• Start a new Visual Basic .NET project
• Change the size of a form
• Change the property values of a form
• Add controls to a form

43
Summary

• Move and resize controls on a form
• Use the Label, TextBox, NumericUpDown, and Button
  controls
• Change the property values of controls
• Change the Name property to rename a control
• Write the code for a Click event procedure

44
Summary

• Display line numbers in the code window
• Use control properties in a method
• Document code with a comment header and comment
  statements