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Recall that you can tell the name of a toolbar control by hovering your cursor over it.
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Now that you have a title on the page, add the controls to the Web Form. You can subsequently return to format the controls. Figure 10-8 displays the Design view after the addition of text and formatting of text in the div block as well as the following steps for the addition of controls to the page. Drag a Label control from the Toolbox immediately after the closing div tag (</div>). Press the Enter key twice to create a separation between the first label control and the Calendar control. Each of the Enter keystrokes adds a br tag to the page. The br tags appear on the page as a carriage return symbol from a keyboard. Drag a Calendar control to the page after the marker for the second br tag. With your cursor immediately below the Calendar control, press the Enter key twice. Drag a second Label control to the page. Press the Enter key again. Drag a third Label control to the page.
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CHAPTER 10 INTRODUCTION TO VISUAL WEB DEVELOPER EXPRESS, WEB PAGES, AND WEB FORMS
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Figure 10-8. You can lay out pages in Design view with the help of the Toolbox and the Format toolbar. The next step is to format the controls. The Calendar control is formatted as in the preceding sample (see, in particular, the Using a Calendar Control section, for the instructions on how to format a Calendar control). Each of the three Label controls receives an assignment to its Text property, from the Properties window in Design view. Assign a value of Pick a day to view a message to the Text property value of Label1. Then, designate a value of Your message is: to the Text property of the second Label control. Finally, clear the default value in the Text property of Label3 to make the control initially appear empty when the page opens.
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Programming the MessageForTheDay Code Module
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The ASP .NET Development Web Server serves the MessageForTheDay.aspx file in a Web browser if you invoke the server by pressing the Ctrl+F5 keystroke. However, nothing happens when you click a day on the Calendar control. To enable the application to work, you need to populate the code module in the MessageForTheDay.aspx.vb file. You can navigate to the code module from Design view by right-clicking any blank area in Design view and choosing View Code. There are four elements to the solution s code: A module level declaration of a String array A Load event procedure for the Page object A Load event procedure for the Form object A SelectionChanged event procedure for the Calendar control A Dim statement at the top of the module declares a String array named Verses (see the following statement). Specifying an upper bound value of 30 in the Dim statement allows 31 array elements with index values of 0 through 30. By declaring the String array at the module level, more than one procedure in the module can reference it. Dim Verses(30) As String
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CHAPTER 10 INTRODUCTION TO VISUAL WEB DEVELOPER EXPRESS, WEB PAGES, AND WEB FORMS
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Instead of returning to the Design view of the page and double-clicking the page in a blank area to create the Load event procedure shell for the Page object, you can create the shell directly from the code module. Select (Page Events) from the Class Name drop-down box at the top left of the code module. Then, select Load from the Method Name drop-down box at the top right of the code module. Immediately after selecting Load, VWDE populates the code module with the Load event procedure shell for the Page object. The following single line of code assigns a Title property value for the Web Form page. Me.Title = "Message for the day" You can populate the code module with a Load event procedure shell for Form1 with the same general approach used for the page Load event procedure shell. Recall that Form1 is the name that the Web Form template assigns to the Form object in a Web Form page. The page Load event occurs before the page initially loads. Similarly, a form Load event occurs before a form on a page loads. Form Load event procedures are useful for allocating or assigning values used by a form. In the current application, the Form1_Load procedure assigns values to the Verses array elements. The index values for the array elements commence at 0 and extend through 30 for a total of 31 array elements. The following listing shows the first couple and last couple of array element assignments. The full list of element assignments is in the Form1_Load procedure of the MessageForTheDay.aspx.vb file in WebSite1. 'Assign array members Me.Verses(0) = _ "Whatsoever things are true, whatsoever things are honest, " & _ "whatsoever things are just ... think about such things. " & _ "Philippians 4:8" Me.Verses(1) = _ "...whosoever believeth in Him should not perish, " & _ "but have eternal life. John 3:15" ... Me.Verses(29) = _ "For my son was dead, and is alive again; he was lost, " & _ "and is found. And they began to be merry. Luke 15:24" Me.Verses(30) = _ "For God sent not his Son into the world to condemn the world; " & _ "but that the world through Him might be saved. John 3:17" The final event procedure is for the Calendar control, which has an ID property value of Calendar1. The event is the SelectionChanged event. You can create the shell for this procedure with the help of the Class Name and Method Name drop-down boxes at the top of the code module. The sole line of code in the procedure extracts the number of the day selected in a month with the Day member of the SelectedDate object returned from Calendar1. Because the days in a month can extend from 1 through 31, but the index values in the Verses array extend from 0 through 30, the procedure uses the Day property value minus 1 for the Verses array index to assign a String value to the Text property of Label1. This code allows the user to determine which message appears in the third label control on the Web Form page. By successively changing the selected date, a user can view a series of messages. Me.Label3.Text = Verses(Me.Calendar1.SelectedDate.Day - 1)
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