A SAMPLE EVENT PROCEDURE in .NET framework

Creating QR Code in .NET framework A SAMPLE EVENT PROCEDURE

EXAMPLE 4.2 A SAMPLE EVENT PROCEDURE
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A typical event procedure is shown below:
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Private Sub Command1_Click() Label1.Caption = "Hello, " & Text1.Text & "! Label1.BorderStyle = 1 Label1.Visible = True End Sub
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Welcome to Visual Basic."
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From the first line (i.e., the Sub statement), we see that this event procedure is associated with command button Command1, and it is a response to a click-type event. The three assignment statements within the event procedure will be executed whenever the user clicks the mouse on command button Command1 during program execution.
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To enter an event procedure, double-click on the appropriate command button within the Form Design Window (see Fig. 1.3), or click once on the command button (to activate it), and then select the Code Editor by clicking on the leftmost button within the Project Window toolbar (see Fig. 4.2). You may then enter the required Visual Basic commands within the corresponding event procedure (see Fig. 1.4 or Fig. 4.6).
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VISUAL BASIC CONTROL FUNDAMENTALS
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Code Editor button
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Fig. 4.2 The Visual Basic Project Window In the next section we will see how the Code Editor is used to enter an event procedure and associate that event procedure with a command button.
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4.7 DISPLAYING OUTPUT DATA (LABELS AND TEXT BOXES) The most straightforward way to display output data is with a label or a text box. A label can only display output data, though a text box can accept input data as well as display output data. For now, however, we will work only with output data. Both of these controls process information in the form of a string. This is not a serious limitation, however, because numeric values can easily be converted to strings via the Str function (see Sec. 2.12). To display output using a label, the basic idea is to assign a string containing the desired output information to the label's Caption property. Similarly, when displaying output using a text box, a string containing the desired output information is assigned to the text box's Text property. The following example illustrates the technique.
Fig. 4.3
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VISUAL BASIC CONTROL FUNDAMENTALS
EXAMPLE 4.3 CURRENT DATE AND TIME
In this example, we create a project that displays the current date and time. To do so, we will make use of the special Visual Basic variable Now, and the Format library function. We will use two label controls to represent permanent headings, and two text box controls to represent the date and time, respectively. In addition, we will utilize two command buttons, one to initiate and/or repeat the computation, and the other to end the computation. Fig. 4.3 shows the preliminary control layout. The next step is to define an appropriate set of properties for the form and each control. Since the controls already have default properties associated with them, we must change only a few of the defaults. The (nondefault) property values for each object are summarized below. Object Form1 Label1 Label2 Text1 Text2 Property Name Caption Caption Font Caption Font BackColor Font Alignment BackColor Font Caption Font Caption Font Value DateAndTime Date and Time Today is . . . MS Sans Serif, 10-point The Current Time is . . . MS Sans Serif, 10-point Light Gray MS Sans Serif, 12-point 2 Center Light Gray MS Sans Serif, 12-point Go MS Sans Serif, 10-point End MS Sans Serif, 10-point
Command1 Command2
Fig. 4.4 shows the appeareance of the form after defining the new properties and resizing the controls.
Fig. 4.4
VISUAL BASIC CONTROL FUNDAMENTALS
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We now define the event procedure associated with the Go button. To do so, double-click on the button, causing the Code Editor Window to be displayed, as shown in Fig. 4.5.
Fig. 4.5
We now add the following two assignment statements to the first event procedure:
Text1.Text = Format(Now, dddd, mmmm d, yyyy ) Text2.Text = Format(Now, hh:mm AM/PM )
In both of these assignment statements, the predefined variable Now represents the current date and time. The term dddd, mmmm d, yyyy is a format string, which indicates how the information represented by Now will appear (in this case, as the day of the week, followed by the month, day and year). Hence, the first command formats the value of Now so that it represents the current day and date; it then assigns this formatted information to the text property associated with the object named Text1. Similarly, the second command formats the value of Now so that it represents the current time, represented as hours and minutes, followed by AM or PM; it then assigns the time to the text property associated with the object named Text2. When the program is executed and the Go button is selected, the two text boxes will therefore display the current day and date and the current time, respectively.
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