how to create qr code in vb.net Part 6: Linking Access and the Web in .NET

Painting Code128 in .NET Part 6: Linking Access and the Web

Part 6: Linking Access and the Web
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Microsoft Office Access 2003 Inside Out
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Part 6: Linking Access and the Web
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Figure 27-48. The Microsoft Script Editor displaying the code behind the dapXmplEmpResRequests sample data access page.
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The editor as implemented in Visual Studio includes many features that you don t need or can t use when editing a data access page. When you first open the editor, you most likely will see the toolbox on the left, and the Project Explorer and Properties windows on the right. In Visual Studio, you can select one of the tools in the toolbox and use it to graphically design the object on a Web page that you re editing, but you use the Access tools to do that for a data access page. The editor also displays Design and Formatting toolbars that have no use in editing a data access page. To give yourself more room to work, you can right-click any toolbar and close the Design and Formatting toolbars by clearing the check mark next to each toolbar name on the shortcut menu. You can also close the toolbox, and the Project Explorer and Properties windows. Your screen should look like Figure 27-49.
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Building Data Access Pages
F27QQ49
Figure 27-49. The script editor window with items closed that you don t need.
Similar to the Visual Basic Editor (VBE), the script editor shows you two drop-down lists at the top of the text editing window. In the left list, you can find all the objects defined on the page. When you select an object on the left, you can see a list of events defined for that object in the list on the right. As with VBE, event procedures currently defined for the page are displayed in bold in the list. Figure 27-50 on the next page shows you the object list open and revealing some of the objects you can find in the sample data access page. In Figure 27-51 on the next page you can see a partial list of the events for the MSODSC object the data source control. Notice that the sample data access page has event procedures defined for the BeforeInitialBind, BeforeInsert, and BeforeUpdate events.
Part 6: Linking Access and the Web
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You re now looking at all the HTML code that defines your data access page. Be careful when working in this window. Because there s nothing to stop you from typing text anywhere in the window, you can easily corrupt the tags that define your data access page. Unless you re an HTML expert, I recommend that you always click the Script Only View button at the right end of the bar above the text (see Figure 27-49) to filter the text you see so that only the script code is displayed on the page.
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Part 1: Part Title
Microsoft Office Access 2003 Inside Out
Part 6: Linking Access and the Web
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Figure 27-50. Some of the objects in the dapXmplEmpResRequests data access page.
Figure 27-51. Some of the events for the data source control object (MSODSC).
Unlike VBE, the script editor doesn t automatically change these two drop-down lists when you click inside the script for an event procedure. However, you can select an object in the left list and then select a boldfaced event in the right list, and the editor takes you to the code that handles the selected event. As you might guess, you can also select an event name in regular font, and the script editor creates a skeleton script entry for the procedure. Tip One script editor window that you might find occasionally useful is the Document Outline window. This window displays all objects defined on the data access page, the events for those objects, and a list of all scripts currently coded within the page. You can open this window by choosing Other Windows on the View menu and then selecting Document Outline on the submenu.
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Creating Scripts for Data Access Pages
You can write code for a data access page to perform virtually any task you can imagine. You can respond to user input, validate data before the data source control saves it, perform actions after data changes, open and examine recordsets, execute action queries, or navigate to other Web pages. As noted earlier, VBScript is very similar to Visual Basic. You can create Function or Sub procedures, declare variables (Dim, ReDim), define loops (Do, While, For Each), perform conditional testing and branching (If, Select Case), trap errors (On Error), and open and manipulate objects. Some of the key differences are
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