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Microsoft Office Access 2003 Inside Out your data access page. However, data access pages do provide an efficient method of distributing applications and data to groups of users who you know have the correct environment groups of employees on an intranet, for example, or limited Internet groups such as field service representatives, sales forces, and customers who have licensed and installed the required Office Web Components. Consider carefully before you make data access page applications available to users connected by a dial-up link. Remember, these users will be reading your Access or SQL Server database directly from their Web browsers using file sharing, which might consume a lot of bandwidth even for well-optimized databases and queries.

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XElement book = new XElement("book", new XAttribute("publicationDate", "October 2005"), new XElement("title", "Ajax in Action") );

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Data access pages are a programmable HTML environment, so in one sense you can create any type of page you care to program in HTML. You can open any data access page (.htm) file in Notepad or any Web page editor such as Microsoft FrontPage and change the HTML code to make the page work or look differently. From within Access, however, you design data access pages in a very similar way to how you design Access forms or reports. The critical component that Access always adds to every data access page is the Microsoft Office Data Source Control (MSODSC) that greatly simplifies fetching, displaying, and updating data from your tables. When you open a data access page, the data source control opens one or more recordsets on your local machine over a network link, displays the result, and provides navigation controls to allow you to move around in the recordset just like you do on a form or report. Data access pages typically feature groups of form fields associated with a record navigation bar. The simplest data access pages display the records from one table and provide a simple navigation bar, as shown in Figure 27-2.

When you want to edit a table that has many records, you can create a data access page that allows the user to selectively filter the records using values in a related table. Figure 27-3 shows you the dapXmplDeptEmployees data access page that allows you to display and edit employees filtered by department.

You can also create a data access page that displays data from one table in a header area and shows you records from a related table in a detail area similar to a form with an embedded subform. This type of data access page is called a banded page. Figure 27-4 shows you the dapXmplFacilitiesAndRooms data access page that is designed in this way.

In this section we ve focused exclusively on using functional construction and the LINQ to XML API for creating XML. We ve also focused on doing so with C# as our programming language. Those VB programmers in the crowd will be excited to know that you re privy to a nice feature called XML literals, which allows you to embed XML directly within your Visual Basic 9.0 code.

Notice that this data access page has two navigation bars. You can use the outer bar to move from one housing facility to another. The inner bar shows you the different rooms defined for the facility in groups of five at a time. As you ll learn later, you can set properties to control how many records a data access page fetches to display in any area. Whether your data access page uses a single table as its source, or multiple tables, you can create a set of form fields to add, change, or display records. Of course, once you ve located a record on an updatable data access page, you can update or delete it. 1019

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When creating XML in Visual Basic 9.0 using LINQ to XML, we can use the functional construction pattern as well as the imperative methods available within the LINQ to XML API. In addition, XML can be embedded directly within VB code using the XML literal syntax. To illustrate the power of the XML literals feature, let s look at how we can construct XML using functional construction and compare it against the code for creating the same XML using XML literals. Let s start by taking a look at the XML we re going to produce.

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