VISUAL BASIC CONTROL FUNDAMENTALS in .NET

Print QR Code in .NET VISUAL BASIC CONTROL FUNDAMENTALS

VISUAL BASIC CONTROL FUNDAMENTALS
QR Code ISO/IEC18004 Scanner In .NET Framework
Using Barcode Control SDK for .NET framework Control to generate, create, read, scan barcode image in .NET applications.
QR Drawer In .NET
Using Barcode creation for Visual Studio .NET Control to generate, create QR Code ISO/IEC18004 image in VS .NET applications.
Object Check3
QR Code ISO/IEC18004 Decoder In Visual Studio .NET
Using Barcode reader for Visual Studio .NET Control to read, scan read, scan image in .NET applications.
Painting Barcode In VS .NET
Using Barcode maker for VS .NET Control to generate, create bar code image in .NET applications.
Property Caption Font Caption Font Caption Font Caption Font Caption Font Caption Font Visible Caption Font Visible Caption Font Visible Caption Font Visible Caption Font Visible Caption Font Visible Caption Font Visible Caption Font Alignment Caption Font Caption Font
Bar Code Recognizer In VS .NET
Using Barcode decoder for .NET framework Control to read, scan read, scan image in Visual Studio .NET applications.
QR Code 2d Barcode Printer In C#.NET
Using Barcode maker for Visual Studio .NET Control to generate, create QR-Code image in VS .NET applications.
Value Hawaiian MS Sans Serif, 10-point Hebrew MS Sans Serif, 10-point Italian MS Sans Serif, 10-point Japanese MS Sans Serif, 10-point Spanish MS Sans Serif, 10-point Bonjour MS Sans Serif, 14-point bold False Guten Tag MS Sans Serif, 14-point bold False Aloha MS Sans Serif, 14-point bold False Shalom MS Sans Serif, 14-point bold False Buon Giorno MS Sans Serif, 14-point bold False Konichihua MS Sans Serif, 14-point bold False Buenos Dias MS Sans Serif, 14-point bold False Say Hello, in . . . MS Sans Serif, 14-point bold 2 Center Go MS Sans Serif, 10-point Quit MS Sans Serif, 10-point
QR Code 2d Barcode Creator In Visual Studio .NET
Using Barcode encoder for ASP.NET Control to generate, create QR-Code image in ASP.NET applications.
Printing QR Code In Visual Basic .NET
Using Barcode maker for .NET framework Control to generate, create QR Code ISO/IEC18004 image in VS .NET applications.
Check4
Generating 2D Barcode In .NET Framework
Using Barcode creator for Visual Studio .NET Control to generate, create Matrix 2D Barcode image in Visual Studio .NET applications.
Bar Code Creation In .NET Framework
Using Barcode maker for .NET Control to generate, create bar code image in VS .NET applications.
Check5
Bar Code Drawer In Visual Studio .NET
Using Barcode drawer for Visual Studio .NET Control to generate, create barcode image in .NET applications.
ISBN Encoder In Visual Studio .NET
Using Barcode generator for Visual Studio .NET Control to generate, create Bookland EAN image in .NET applications.
Check6
Paint Code-39 In None
Using Barcode generation for Word Control to generate, create Code 3/9 image in Office Word applications.
Bar Code Encoder In VS .NET
Using Barcode maker for ASP.NET Control to generate, create barcode image in ASP.NET applications.
Check7
USS Code 128 Scanner In None
Using Barcode decoder for Software Control to read, scan read, scan image in Software applications.
Encoding GTIN - 128 In None
Using Barcode creator for Online Control to generate, create EAN 128 image in Online applications.
Label1
EAN-13 Creation In Java
Using Barcode generation for Android Control to generate, create GTIN - 13 image in Android applications.
Encode UCC-128 In None
Using Barcode maker for Excel Control to generate, create USS-128 image in Excel applications.
Label2
ECC200 Decoder In Visual Basic .NET
Using Barcode recognizer for .NET Control to read, scan read, scan image in VS .NET applications.
Recognizing UPCA In None
Using Barcode scanner for Software Control to read, scan read, scan image in Software applications.
Label3
Label4
Label5
Label6
Label7
Label8
Command1
Command2
VISUAL BASIC CONTROL FUNDAMENTALS
[CHAP. 4
Fig. 4.17 shows the Form Design Window, after assigning these property values, rearranging and resizing the controls.
Fig. 4.17
Finally, we add the following instructions to the event procedures associated with the Go and Quit command buttons:
Private Sub Command1_Click() If (Check1.Value = 1) Then Label1.Visible = True Else Label1.Visible = False End If If (Check2.Value = 1) Then Label2.Visible = True Else Label2.Visible = False End If If (Check3.Value = 1) Then Label3.Visible = True Else Label3.Visible = False End If If (Check4.Value = 1) Then Label4.Visible = True Else Label4.Visible = False End If If (Check5.Value = 1) Then Label5.Visible = True Else Label5.Visible = False End If
CHAP. 4]
VISUAL BASIC CONTROL FUNDAMENTALS
If (Check6.Value = 1) Then Label6.Visible = True Else Label6.Visible = False End If If (Check7.Value = 1) Then Label7.Visible = True Else Label7.Visible = False End If End Sub Private Sub Command2_Click() End End Sub
The first event procedure (Command1_Click) is associated with the Go button. It includes seven independent If-Then-Else statements. Each of these statements determines whether or not a check box has been checked. If so, the corresponding label (which represents the Hello expression) is made visible (i.e., Label1.Visible = True, etc); otherwise, the corresponding label is made invisible (Label1.Visible = False, etc.). In order to run this program, the user must select one or more of the check boxes and then click on the Go button. The results of a typical execution are shown in Fig. 4.18. The user may continue this process by selecting different boxes and clicking on Go after each selection. The entire process ends when the user clicks on the Quit button.
Fig. 4.18
4.10 SELECTING EXCLUSIVE ALTERNATIVES (OPTION BUTTONS AND FRAMES) Option buttons, like check boxes, allow the user to select among several different alternatives. However, check boxes allow the selection of any number of alternatives (including none), whereas option buttons allow the
VISUAL BASIC CONTROL FUNDAMENTALS
[CHAP. 4
selection of one and only one alternative within an option-button group. Normally, all of the option buttons within a form comprise a single option-button group. (More about this later.) In order to select an option button, the user must click on the button, causing a small dot to appear within the outer circle. The value of the option button s Value property will then be set to True. The dot will simultaneously disappear from any previously selected button (since only one option button can be selected at any time), and its Value property will be assigned the value False. An event procedure containing an If-Then-Else block can then determine which button has been selected, and the appropriate action taken. The procedure is illustrated in the following example.
EXAMPLE 4.7 SELECTING EXCLUSIVE ALTERNATIVES (TEMPERATURE CONVERSION)
This example presents a program to convert temperatures from degrees Fahrenheit to degrees Celsius or from degrees Celsius to degrees Fahrenheit, based upon the well-known formulas C = (5/9) ( F 32) and F = 1.8 C + 32
where C represents the temperature in degrees Celsius and F represents the temperature in degrees Fahrenheit. Two option buttons will be used to select the particular conversion. In addition, we will use three labels, two text boxes (for the given temperature and the equivalent temperature, respectively), and two command buttons (to initiate or repeat the computation, and to terminate). Fig. 4.19 shows the preliminary control layout.
Copyright © OnBarcode.com . All rights reserved.