Looping and Multiple Forms

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Chapter 6

• Looping andMultiple Forms

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Objectives

• Add additional forms to a project
• Change the default icon on the title bar of a
  form
• Use the ListView controls to display a list of
  items on a form
• Use the CheckBox controls in an application
• Use the Anchor property of controls

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Objectives

• Work with Collections in code
• Code a Do Until loop
• Code a Do While loop
• Code a ForNext and a For EachNext loop
• Code a concatenation operator

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Objectives

• Code a keyboard event
• Code a form Resize event procedure
• Work with multiple code windows
• Specify a Startup object for a project

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Creating the User Interface

• Open a New Project named Todays Sales Check in
  the Chapter6 folder on your Data Disk
• Set the following properties for your form

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Creating the User Interface

• Add a ListView control and three Button controls
  to your form
• Select the Icon property in the Properties window
• Click the Icon property ellipsis button.
• Select the CHECKMRK file from the C\Program
  Files\Microsoft Visual Studio .NET\Common7\Graphic
  s\Icons\Misc folder
• Click the Open button

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Changing the Properties of a ListView Control

• Click the Columns property ellipsis button in the
  ListView Control Properties window
• Click the Add button
• Select the Text property value for the
  ColumnHeader1 member. Type Item Description as
  the property value. Select the Width property
  value for the ColumnHeader1 member. Type 190 as
  the property value and click the Add button

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Changing the Properties of a ListView Control

• Select the Text property value for the
  ColumnHeader2 member and type Total Sales as the
  property value.
• Select the Width property value for the
  ColumnHeader1 member and type 79 as the property
  value.
• Click the Add button.
• When the ColumnHeader3 member is added, select
  the Text property value for the ColumnHeader3
  member. Type On Sale as the property value and
  click OK

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Anchoring Controls

• Select the three button controls on the form, by
  holding CTRL while clicking each button
• Click the button anchor indicator to select it.
  Click the left and top anchor indicators to
  deselect them and press ENTER
• Select lstTodaysSales and click the down arrow in
  the Anchor property of the Properties window
• Click the bottom and right anchors to select
  them, and press ENTER

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Changing the File Name of a Form

• Right-click the Form1.vb form in the Solution
  Explorer window
• Click the Rename command on the shortcut menu.
  Type Todays Sales Check Form.vb and press ENTER

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Adding a Form to a Project and Creating the
Interface

• Right-click the Todays Sales Check project in
  the Solution Explorer window and then point to
  Add on the shortcut menu
• Click the Add Windows Form command on the Add
  submenu and select Form1 in the Name text box and
  then type Add Item Form
• Click the Open button

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Creating an Interface on a Newly Added Form

• Add two Label controls, one TextBox control, one
  NumericUpDown control, a CheckBox control, and a
  button control
• Set the form, label, text box, and
  NumericUpDowncontrol properties as specified on
  pages VB 6.31 and VB 6.32

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CheckBox Control Properties
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Declaring an Object Using an Object Variable
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Declaring an Object and Showing a Form

• Enter the code below, beginning on line 119

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Looping and the Do Statement
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The Do While and Do Until Statements
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The WhileEnd While Statement
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Implementing a Loop Using a Do Until Statement

• Enter the following code, starting on line 136

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Working with Collections in ListView Controls

• Group of one or more objects that can be accessed
  and operated on as a single entity

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Adding Items to a ListView Control

• Text Property
• SubItems Property

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Adding Items to a ListView Control

• Enter the following code, starting on line 137

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ForNext Statement

• Great for counter-controlled loops
• More efficient than a Do While Loop
• Easier to read
• Uses less memory
• Faster execution

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The Execution of a ForNext Loop

• The first time the loop executes, intNumber is
  initialized at 1
• intNumber is compared with 100. Because it is
  less than or equal to 100, the statements in the
  For loop are executed
• Control returns to the For statement, where the
  value of intCount is incremented by 1

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The Execution of a ForNext Loop

• If the value of intCount is less than or equal to
  100, execution of the ForNext loop continues
• When the value of intCount is greater than 100,
  control transfers to the statement following the
  corresponding Next statement

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Exiting a Loop Prematurely The Exit Statement
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Nested ForNext Loops
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Implementing a Loop Using a ForNext Statement
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Implementing a Loop Using a ForNext Statement

• Enter the following code, starting on line 150

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The For EachNext Statement
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Coding the String Replace() Method

• Click line 163 and enter the code below
• This code replaces the dollar sign in the
  strItemSales variable with a 0, so that the
  string can be converted to a number and used in
  an expression

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String Manipulation
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Concatenation Operators
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Coding a Concatenation Operator

• Enter the code below, starting on line 164

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Removing Items from a ListView Control

• Click the Todays Sales Form.vbDesign tab in the
  main work area. Double-click the btnClearList
  button. When the code window appears, click line
  181 and then enter the code below

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Keyboard Events

• Click the Object box arrow in the code window
• Click lstTodaysSales in the Object list. Click
  the Procedure box arrow in the code window.
  Select KeyDown in the Procedures list
• Enter the code below, starting on line 185

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Coding a Form Resize Event

• Click the Object box arrow in the code window
• Click Base Class Events in the Object list.
  Click the Procedures box arrow in the Procedures
  box in the code window. Select Resize in the
  Procedures list
• Enter the below lines of code, starting on line
  191

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The Me Keyword and Coding a Second Form

• Click the Add Item Form.vbDesign tab in the
  main work area. Double-click the btnOK button.
  Enter Option Strict On as the first line of code
  in the form
• Enter lines 120 through 127 of the code on the
  following slide
• Click the Add Item Form.vbDesign tab in the
  main work area. Double-click any blank area on
  the form. Type lines 131 through 136 of code in
  the frmAddItem_Load event procedure

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Setting the Startup Object for a Project

• Click the Todays Sales Check project in the
  Solution Explorer window and then click the
  Property Page button in the Properties window
• Click the Startupobject box arrow. Select
  frmTodaySalesCheck in the list

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• Click the OK button

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Finish the Project

• Click the Save All button on the Standard toolbar
• Test your project with the test data on page VB
  6.79
• Print your programs documentation
• Quit Visual Basic .NET

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Summary

• Add additional forms to a project
• Change the default icon on the title bar of a
  form
• Use the ListView controls to display a list of
  items on a form
• Use the CheckBox controls in an application
• Use the Anchor property of controls

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Summary

• Work with Collections in code
• Code a Do Until loop
• Code a Do While loop
• Code a ForNext and a For EachNext loop
• Code a concatenation operator

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Summary

• Code a keyboard event
• Code a form Resize event procedure
• Work with multiple code windows
• Specify a Startup object for a project

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Chapter 6 Complete