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Synchronizing with a DataSet Object You can synchronize a DataSet object with an XmlDataDocument object in various ways For example, you can start by populating a DataSet object with schema and data and then pass it on to a new XmlDataDocument object, as shown here: DataSet data = new DataSet(); // Populate the DataSet with schema and data XmlDataDocument dataDoc = new XmlDataDocument(data); In this case, the XML DOM object is created from the relational data Alternatively, you can set up the DataSet object with schema only, associate it with the XmlDataDocument class, and then populate the XML DOM object with XML data, as shown in the following code In this way, the DataSet object is filled with hierarchical data DataSet data = new DataSet(); // Populate the DataSet only with schema information XmlDataDocument dataDoc = new XmlDataDocument(data); dataDoc.

Load(xmlfile); Note that an exception is thrown if you attempt to load an XmlDataDocument object synchronized with a DataSet object that contains data You can take a third route You can instantiate and load an XmlDataDocument object and then extract the corresponding DataSet object from it, as shown here: XmlDataDocument dataDoc = new XmlDataDocument(); DataSet data = dataDocDataSet; // Add schema information to the DataSet dataDocLoad(xmlfile); In this case, no DataSet object is explicitly passed in by the user The default constructor creates an empty DataSet object anyway that is then filled when the XmlDataDocument object is loaded A client application can get a reference to the internal DataSet object by using the DataSet property An important issue to consider is that the DataSet object can't be filled if no schema information has been set.

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Query dialog box directly, then navigate to the page using the address bar at the top of the dialog box.

You can manually create tables and columns in the DataSet object or read the information from an XML stream using the ReadXmlSchema method (More on this topic in 9) XML Data Fidelity To fill a DataSet object with XML data, you can use one of two methods The first method is to use the DataSet object's ReadXml method (see 9) The second method is to load the data as XML into an instance of the XmlDataDocument class, and then use the XmlDataDocument DataSet method to fill the DataSet object The two approaches differ significantly in terms of data fidelity When ReadXml is used and the data is written back as XML, all extra XML information such as white spaces, processing instructions, and CDATA sections is irreversibly lost.

At first blush, the difference between Mail Merge and templates may not seem terribly important. The goal of each is to simplify the document creation process. But there is an important difference between the two. First, templates will ensure consistent formatting. They will even help you with standard text that appears in all documents created from a particular template. On the other hand, Mail Merge aims to help you create multiple documents that contain the same text, but are customized for individual readers. Of course, adept users can add extra text to specific documents via the use of a field, but most users won t do this. Templates and Mail Merge are not mutually exclusive. It is not uncommon to use a template as the main document for a Mail Merge operation: the template ensures that the text is formatted correctly, while the Mail Merge portion ensures that the correct text is entered.

This happens because the DataSet relational format simply does not know how to handle information that is meaningful only to the hierarchical model When the DataSet object is filled using an XML document loaded into XmlDataDocument, the DataSet object still contains a simplified and adapted representation of the hierarchical contents but the original XML document is preserved intact 304.

You can refresh the query data manually or automatically. To refresh data manually, select any cell in the refreshable query results and click the Refresh Data button on the External Data toolbar. If the Refresh Data dialog box opens, click OK. To have your query update automatically, click the Data Range Properties button on the External Data toolbar to open the External Data Range Properties dialog box (see Figure 8-7).

Nested Data Relations If the DataSet object to be synchronized with an XmlDataDocument object contains one or more relations (instances of the DataRelation object), you should set the Nested property of the DataRelation object to true In this way, the child rows of the relation will be nested within the parent column when written as XML data or synchronized with an XmlDataDocument object By default, the Nested property of the DataRelation object is false Reading Data as XML Representing a DataSet object with an instance of the XmlDataDocument class allows you to use XPath expressions to select data In general, using XPath queries to select XML data makes sense especially if you have XML DOM data disconnected and stored in memory that is, if you use XmlDataDocument In doing so, you actually work on an XML DOM object and don't in any way tax the database.

Pay attention when using this technique in Microsoft ASPNET applications In this case, the client lives on the Web server, and you end up occupying the Web server's memory with potential hits on the overall performance and scalability Using XPath to query XML representations of data relationally stored in SQL Server (for example, annotated schemas) seems to be a rather twisted and ineffective way to execute queries The query engine of SQL Server, therefore, outperforms the XPath query engine not to mention that to run slower queries, you still have to pay the price of transforming relational data in XML Reading database contents as XML makes sense only if you need to represent that information in an intermediate format for further transformations and processing Currently, the best approach is still relying on FOR XML using the EXPLICIT operator if you need complex schemas.

In the Refresh control section of the dialog box, leave the default Enable background refresh setting if you want to be able to work in Excel while the query data is being refreshed. To have Excel automatically refresh the data, enable the Refresh every checkbox and set the refresh frequency using the spin box minutes control. If your query returns a large data set, you can reduce the file size by setting the query refresh options. Have Excel refresh the query data when you open the file, then discard the data when you save the workbook. In the External Data Range Properties dialog box, enable the Refresh data on file open checkbox. Enable the Remove external data from worksheet before saving checkbox to discard the query results when you save the workbook.

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