Mastering Visual Basic .NET

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186 Chapter 5 WORKING WITH FORMS VB6 ➠ VB.NET The Form Designer is one of the most improved areas of VB.NET. For the first time, you can design forms that can be easily resized—anyone who has programmed in earlier versions of VB knows what a hassle the resizing of forms could be. The Anchor and Dock properties allow you to anchor controls on the edges of the form and dock them on the form. When the form is resized, the controls on it can be either resized or moved to new locations, so that they remain visible. If the controls can’t fit the form, scroll bars can appear automatically, so that users can scroll the form in its window and bring another section into view, if the form’s AutoScroll property is True. Scrolling forms are also new to VB.NET. A new special control was added, whose sole purpose is to act as a pane separator on forms: the Splitter control. This control is a thin horizontal or vertical stripe that allows you to resize two adjacent controls. If two TextBox controls on the same form are separated by a Splitter control, users can shrink one TextBox to make more room for the other. Again, no code required. Of course, many things have changed too. You can no longer show a form by calling its Show method. You must first create an instance of the form (a variable of the Form type) that you want to show and then call the Show method of this variable. You no longer have arrays of controls. This isn’t much of a problem, though, because with VB.NET you can create instances of new controls from within your code and position them on the form. The Appearance of Forms Applications are made up of one or more forms (usually more than one), and the forms are what users see. You should craft your forms carefully, make them functional, and keep them simple and intuitive. You already know how to place controls on the form, but there’s more to designing forms than populating them with controls. The main characteristic of a form is the title bar on which the form’s caption is displayed (see Figure 5.1). Figure 5.1 The elements of the form Control menu Title bar Minimize button Maximize button Close button
Clicking the icon on the left end of the title bar opens the Control menu, which contains the commands shown in Table 5.1. On the right end of the title bar are three buttons: Minimize, Maximize, and Close. Clicking these buttons performs the associated function. When a form is maximized, the Maximize button is replaced by the Restore button. When clicked, this button resets the form to the size and position before it was maximized. The Restore button is then replaced by the Maximize button. Table 5.1: Commands of the Control Menu Command Effect Restore Restores a maximized form to the size it was before it was maximized; available only if the form has been maximized Move Lets the user move the form around with the mouse Size Lets the user resize the form with the mouse Minimize Minimizes the form Maximize Maximizes the form Close Closes the current form THE APPEARANCE OF FORMS Properties of the Form Control You’re familiar with the appearance of the forms, even if you haven’t programmed in the Windows environment in the past; you have seen nearly all types of windows in the applications you’re using every day. The floating toolbars used by many graphics applications, for example, are actually forms with a narrow title bar. The dialog boxes that display critical information or prompt you to select the file to be opened are also forms. You can duplicate the look of any window or dialog box through the following properties of the Form object. AcceptButton, CancelButton These two properties let you specify the default Accept and Cancel buttons. The Accept button is the one that’s automatically activated when you press Enter, no matter which control has the focus at the time, and is usually the button with the OK caption. Likewise, the Cancel button is the one that’s automatically activated when you hit the Esc key and is usually the button with the Cancel caption. To specify the Accept and Cancel buttons on a form, locate the AcceptButton and Cancel- Button properties of the form and select the corresponding controls from a drop-down list, which contains the names of all the buttons on the form. You can also set them to the name of the corresponding button from within your code. 187
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Using Your Sybex Electronic Book To
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Associate Publisher: Richard Mills
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To my family
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Contents at a Glance Introduction.
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Introduction Welcome to .NET and Vi
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INTRODUCTION How About the Advanced
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INTRODUCTION browser. Web services
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Chapter 1 Getting Started with VB.N
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Figure 1.1 This is what you’ll se
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Figure 1.3 The integrated developme
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In the Properties window, also know
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THE INTEGRATED DEVELOPMENT ENVIRONM
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Figure 1.8 A simple application tha
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Listing 1.1: Processing a User-Supp
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Figure 1.10 Displaying options on a
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THE IDE COMPONENTS As you realize,
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Figure 1.13 Viewing the possible se
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THE IDE COMPONENTS Tools Menu This
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generated by the compiler, and you
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Controls expose methods, too, which
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a new application, place a Button c
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Listing 1.4: A Console Application
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Chapter 2 Visual Basic Projects The
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value. In effect, this is the essen
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BUILDING A LOAN CALCULATOR 2. Place
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Show Payment button won’t have an
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◆ The second argument is the dura
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BUILDING A LOAN CALCULATOR Exit Sub
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The Single data type can hold much
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aligned in many ways, so don’t wo
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Listing 2.4: The Clear Button Priva
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subroutine on a form on which the v
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The result variable will most likel
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clearDisplay = True End Sub Private
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VB6 programmers used the term error
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little early in the book to discuss
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TAKING THE LOANCALCULATOR TO THE WE
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Figure 2.9 Editing the Web form’s
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created and displayed. If the varia
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WORKING WITH MULTIPLE FORMS Working
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Applications designed for the Windo
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Figure 2.15 Adding a Setup and Depl
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The Manufacturer property will beco
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you’re ready to build an installe
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Verifying the Installation You alre
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Chapter 3 Visual Basic: The Languag
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Variables in VB.NET are more than j
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When you declare variables in your
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If you want to declare multiple var
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Table 3.1: Visual Basic Numeric Dat
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In a button’s Click event handler
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of the floating point, and it’s a
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and display the variable’s value:
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This listing will generate a NaN va
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Boolean operators operate on Boolea
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Char data type exposes interesting
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If the Strict option is on, you can
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Figure 3.1 Setting the Strict and E
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This is called late binding, and it
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subtle errors, and they avoid it. I
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When the Strict option is On, VB.NE
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To declare variables of this new ty
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{ use brush object to draw with } b
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numeric value, or click the Cancel
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variable without good reason. Varia
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they’re used by a couple of funct
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The name of the constant follows th
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salary, but even this data can be h
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The first element is names(0), and
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You can think of a three-dimensiona
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Note that the ReDim statement can
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VARIABLES AS OBJECTS the meantime,
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Notice that ToString is a method, n
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Page 149 and 150: If…Then…Else A variation of the
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Page 161: SUMMARY Summary It’s been a long
Page 164 and 165: 152 Chapter 4 WRITING AND USING PRO
Page 197: Chapter 5 Working with Forms In Vis
Page 201 and 202: AutoScrollMinSize This property let
Page 203 and 204: Or, you can set the width and heigh
Page 205 and 206: “Building Dynamic Forms at Runtim
Page 207 and 208: Figure 5.4 A simple data-entry scre
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Page 211 and 212: Figure 5.5 The settings of the Anch
Page 213 and 214: Figure 5.8 Filling a form with two
Page 215 and 216: Figure 5.10 An elaborate form with
Page 217 and 218: There’s a better approach to impo
Page 219 and 220: As mentioned earlier, the Paint eve
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Page 223 and 224: Another technique for exposing the
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Page 227 and 228: Listing 5.5: Prompting the User for
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Page 233 and 234: Table 5.6: The Captions and Names o
Page 235 and 236: Programming Menu Commands Menu comm
Page 237 and 238: DESIGNING MENUS Using Access and Sh
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Next Else For i = Me.Controls.Count
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Creating Event Handlers at Runtime
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Chapter 6 Basic Windows Controls In
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THE TEXTBOX CONTROL Basic Propertie
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THE TEXTBOX CONTROL The AcceptsTab
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Listing 6.1: Locating a String in a
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SelectedText property. To convert t
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THE TEXTBOX CONTROL Undoing Edits A
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Table 6.1: The Menu of the TextPad
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The Process and Customize Menus The
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the control to be shared. In our ca
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The code of the Find Again button i
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some custom preprocessing of the da
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With a little additional effort, yo
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Items The Items property is a colle
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Each member of the Items collection
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where item is the object to be adde
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Figure 6.7 ListDemo demonstrates mo
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The second arrow button transfers i
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If you search for “SAC”, for ex
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There’s one aspect worth mentioni
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You can also add new items at runti
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VB.NET at Work: The Colors Project
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Listing 6.17: Programming the Scrol
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The Label controls below the tick m
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Listing 6.19: SelectionChanged Even
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290 Chapter 7 MORE WINDOWS CONTROLS
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Chapter 8 Building Custom Classes C
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BUILDING THE MINIMAL CLASS you must
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The following lines will be printed
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Every time you create a new variabl
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Throw AgeException Else tAge = Valu
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Now we must do something about the
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The last two statements will print
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Note Note that the custom Equals me
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First, you must change the type of
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provide a handler for the event, th
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After this declaration, the TimerOb
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done is out of the question, so thi
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When an application initiates an op
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class’s type. If the class has al
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Note You can use the Split method o
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strNum = strNum & “ And “ & For
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openFileDialog1.ShowDialog() Consol
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Get ContactName = _contactName End
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method, so we must provide our own
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contact.EMail = txtEMail.Text conta
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So, how can we update a class that
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Original List After Elimination of
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Polymorphism This is another powerf
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If there are properties common to a
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Testing the Shape Class To test the
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Let’s start with the Triangle cla
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the month that was passed to the me
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WHO CAN INHERIT WHAT? Derived Class
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Get Property2 = “Original Propert
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Is it reasonable for a method of th
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The result of a matrix operation is
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Chapter 9 Building Custom Windows C
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ENHANCING EXISTING CONTROLS Designe
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Then save the project by selecting
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add some visual indication when a m
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Figure 9.3 The custom properties of
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Building Compound Controls A compou
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You can also specify a color value
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Building User-Drawn Controls This i
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Table 9.2: The Settings of the Effe
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The current settings of the two pro
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This subroutine calls for a few exp
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The Changed Events The UserControl
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Then, declare the following event i
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Listing 9.12: Setting Up the Two Al
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The procedures for implementing the
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The code also compares the current
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Listing 9.19: The RoundButton Contr
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ackground of each item, draw the te
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technique—for example, you can pl
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To test the enhanced ListBox contro
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Listing 9.25: Navigating to a URL w
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Chapter 10 Automating Microsoft Off
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The New keyword tells VB to create
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Objects That Represent Text The mos
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As with the Print method, the argum
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You can then apply the Range object
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of the members of the WDSelectionTy
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.Font.Size = WordApp.Selection.Font
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MsgBox(“The document contains “
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upon Word’s spell-checking routin
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Dim SpellCollection As Word.Proofre
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ListBox2.Items.Add(ListBox1.Items(w
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To access an individual worksheet,
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The Clear method resets all the cel
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Listing 10.9: Preparing a New Sprea
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Figure 10.5 This spreadsheet was cr
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to the cell, and if you read back t
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Figure 10.6 The properties of the C
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For cnt = 1 To allContacts.Items.Co
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Figure 10.8 Demonstrating how to re
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In the Messages project, you use th
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the case for users with a small num
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newNode = parentNode.Nodes.Add(subF
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Part III Basic Framework Classes In
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480 Chapter 11 STORING DATA IN COLL
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530 Chapter 12 HANDLING STRINGS, CH
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570 Chapter 13 WORKING WITH FOLDERS
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Part IV Intermediate Programming In
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620 Chapter 14 DRAWING AND PAINTING
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Chapter 15 Printing with VB.NET The
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This is same object we used in the
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dialog box was discussed in Chapter
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PrintPreviewDialog This is another
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The PrinterSettings object is a pro
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These statements will produce outpu
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e.Graphics object represents the dr
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VB.NET at Work: The PageSettings Pr
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e.Graphics.TranslateTransform(X, Y)
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X = (LMargin - strHeight) / 2 Y = T
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e.Graphics.ResetTransform() e.Graph
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each row depends on the height of t
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a line for each author. The followi
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W1 = X2 - X1 W2 = X3 - X2 W3 = page
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VB.NET at Work: The PrintText Proje
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start a new line with the last word
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on the previous page. This method i
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ectangle as possible, even if the l
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End If If PictHeight < .Height Then
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Listing 15.14: Printing a Simple Do
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SUMMARY Summary Printing is a major
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742 Chapter 16 THE TREEVIEW AND LIS
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Chapter 17 Error Handling and Debug
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Figure 17.3 Once declared, the vari
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the manager of the department calls
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Studying an Exception The exception
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exception is generated, so it’s d
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Listing 17.7: Handling an Exception
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This code is taken from a ProgressB
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The figure displays the first of th
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We’ve seen that error before—it
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SUMMARY Note There are many more ad
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812 Chapter 18 RECURSIVE PROGRAMMIN
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Chapter 19 The Multiple Document In
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MDI APPLICATIONS: THE BASICS of the
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New command. Before we can open a c
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The other four options of the Windo
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and ends with a separator. The top
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Figure 19.5 The parent menu (top le
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To access the contents of a TextBox
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Programming the New Command The New
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Listing 19.6: The Save Command Priv
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If Me.ActiveMdiChild Is Nothing The
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ttnFindNext.Enabled = True bttnRepl
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may have to maintain a list of True
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2. Rename the form to MDIImage and
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The code resizes the PictureBox con
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SUMMARY Summary In this, the last c
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Chapter 20 Databases: Architecture
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how to extract data from your datab
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Suppliers Table Each product has a
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WHAT IS A DATABASE? Exploring the P
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WHAT IS A DATABASE? is the foreign
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(basically, the driver you’ll use
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Figure 20.7 Editing the Customers t
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THE SERVER EXPLORER in the U.S., yo
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THE SERVER EXPLORER Enforce relatio
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THE SERVER EXPLORER Indexes/Keys Ta
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To make a constraint part of the da
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Alternatively, you can prefix the S
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the WHERE clause to specify how the
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names from the Customers table, you
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This statement will calculate the s
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FROM [Order Details] WHERE ProductI
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You can retrieve the same rows usin
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Limiting Groups with HAVING The HAV
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If you want to specify values for a
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operations, instead of typing compl
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If you paste this statement in the
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field in the Orders table. A new li
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dbo.Products.ProductID = dbo.[Order
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TitleAuthor, and Authors. Then chec
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This time the Query Builder will ge
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The first statement alters the proc
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Select all the text on the editor a
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it would be replaced by the second
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Chapter 21 Building Database Applic
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THE ARCHITECTURE OF ADO.NET the mod
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The first object, SqlConnection1, i
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Figure 21.2 To generate a DataSet,
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The first statement clears the curr
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to the parent table, select another
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CREATING A DATASET By default, the
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on the Data Adapter Configuration W
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Listing 21.1: Populating a DataSet
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and the Tag property to the table
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The PositionChanged() subroutine di
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and rename it to LookupCustomers. T
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DataSet. You can select a few field
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Listing 21.8: Navigating via the Li
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PROGRAMMING THE DATAADAPTER OBJECT
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Listing 21.9: Selecting Customer’
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THE COMMAND AND DATAREADER OBJECTS
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at all, and it’s certainly more e
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While SQLReader.Read txtOrders.Text
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964 Chapter 22 PROGRAMMING THE ADO.
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VB.NET on the Web Part VI In this s
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1000 Chapter 23 INTRODUCTION TO WEB
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1048 Chapter 24 ACCESSING DATA ON T
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Chapter 25 XML Web Services The las
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Building a Web Service In all previ
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The two methods are hyperlinks. Cli
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As you can see, each Web service is
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that appears (Figure 25.5), enter t
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original error message is embedded
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This is a good point to change the
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Figure 25.11 Binding a DataGrid Web
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Mastering Visual Basic .NET

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