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As mentioned, in ADO.NET both the DataSet object and the DataTable object implement the ISerializable interface, thus making themselves accessible to any .NET Framework serializers. Only the DataSet object, however, exposes additional methods (for example, WriteXml) to let you explicitly save the contents to XML. We'll explore the various aspects of ADO.NET object serialization in the section "Binary Data Serialization," on page 422. In the meantime, let's see how to extend the DataTable and DataView objects with the equivalent of a WriteXml method. Serializing DataTable Objects The .NET Framework does not allow you to save a stand-alone DataTable object to XML. (A stand-alone DataTable object is an object not included in any parent DataSet object.) Unlike the DataSet object, the DataTable object does not provide you with a WriteXml method. Nevertheless, when you persist a DataSet object to XML, any contained DataTable object is regularly rendered to XML. How is this possible The DataSet class includes internal methods that can be used to persist an individual DataTable object to XML. Unfortunately, these methods are not publicly available. Saving the contents of a stand-alone DataTable object to XML is not particularly difficult, however, and requires only one small trick. The idea is that you create a temporary, empty DataSet object, add the table to it, and then serialize the DataSet object to XML. Here's some sample code: public static void WriteDataTable(DataTable XmlWriteMode mode) 338 dt, string outputFile,

{ DataSet tmp = CreateTempDataSet(dt); tmp.WriteXml(outputFile, mode); } This code is excerpted from a sample class library that provides static methods to save DataTable and DataView objects to XML. Each method has several overloads and mimics as much as possible the DataSet object's WriteXml method. In the preceding sample code, the input DataTable object is incorporated in a temporary DataSet object that is then saved to a disk file. The following code creates the temporary DataSet object and adds the DataTable object to it: private static DataSet CreateTempDataSet(DataTable dt) { // Create a temporary DataSet DataSet ds = new DataSet("DataTable"); // Make sure the DataTable does not already belong to a DataSet if (dt.DataSet == null) ds.Tables.Add(dt); else ds.Tables.Add(dt.Copy()); return ds; } Note that a DataTable object can't be linked to more than one DataSet object at a time. If a given DataTable object has a parent object, its DataSet property is not null. If the property is not null, the temporary DataSet object must be linked to an in-memory copy of the table. The class library that contains the various WriteDataTable overloads is available in this book's sample files and is named AdoNetXmlSerializer. A client application uses the library as follows: StringWriter writer = new StringWriter(); AdoNetXmlSerializer.WriteDataTable(m_data, writer); // Show the serialization output OutputText.Text = writer.ToString(); writer.Close(); Figure 9-6 shows the sample application in action.

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SPS and WSS share a number of common features. This simplifies training and provides consistency for users between the portal and their work in smaller teams and workgroups. In this section, we ll briefly describe the common features before talking about the integration of Excel and SharePoint.

Figure 9-6: An application that passes some data to a DataTable object and then persists it to XML. So much for DataTable objects. Let's see what you can do to serialize to XML the contents of an in-memory, possibly filtered, view. Inside the DataView Object The DataView class represents a customized view of a DataTable object. The relationship between DataTable and DataView objects is governed by the rules of a well-known design pattern: the document/view model. According to this model, the DataTable object acts as the document, and the DataView object acts as the view. At any moment, you can have multiple, different views of the same underlying data. More important, you can manage each view as an independent object with its own set of properties, methods, and events. The view is implemented by maintaining a separate array with the indexes of the original rows that match the criteria set on the view. By default, the table view is unfiltered and contains all the records included in the table. By configuring the RowFilter and RowStateFilter properties, you can narrow the set of rows that fit into a particular view. Using the Sort property, you can apply a sort expression to the rows in the view. Figure 9-7 illustrates the internal architecture of the DataView object.

By customizing AutoText entries, you can make creating documents even easier. To add AutoText entries, you must first open the Normal.dot template, the template upon which all Word documents are based. The default location for the Normal.dot template in Windows XP is C:\Documents and Settings\user name\Application Data\Microsoft\Templates. Navigate to it via the Open dialog box in Word and open it.

Figure 9-7: A DataView object maintains an index of the table rows that match the criteria. When any of the filter properties is set, the DataView object gets from the underlying DataTable object an updated index of the rows that match the criteria. The index is a simple array of positions. No row objects are physically copied or referenced at this time. 340

Organizations that use Microsoft Windows Server Active Directory (AD) to administer user rights on a network can use the same system to manage SharePoint security. AD effectively controls access to SharePoint sites without adding another layer to an already complex system of security. Only individuals and groups that exist in AD can be granted SharePoint permissions. Organizations that use externally hosted SharePoint sites or that don t use AD can add users, based on their e-mail addresses, directly to a SharePoint site. SharePoint site administrators can take permissions a step further within each SharePoint site by designating permissions to document libraries, lists, and other site content (see more about site content in the section Web Parts, Lists, and Libraries later in the chapter). For example, all users within a company might be granted reader permissions to an SPS site. However, only specially designated and trained individuals can add site content or modify the site. Other users might be granted contributor access to a WSS site that was created for a team project they re working on. When a new user is added to a WSS site, the site administrator can set permission levels for the user. Figure 1-3 shows the Add Users page of a WSS site.

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