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Figure 9-9: The difference between ordinary and custom binary serialization. In particular, consider the DataTable object resulting from the following query: SELECT * FROM [Order Details] The table contains five columns and 2155 records. It would take up half a megabyte if serialized to the binary formatter as a DataTable object. By using an intermediate ghost class, the size of the output is 83 percent less. Looking at things the other way round, the results of the standard serialization process is about 490 percent larger than the results you obtain using the ghost class. Of course, not all cases give you such an impressive result. In all the tests I ran on the Northwind database, however, I got an average 60 percent reduction. The more the table content consists of numbers, the more space you save. The more BLOB fields you have, the less space you save. Try running the following query, in which photo is the BLOB field that contains an employee's picture: SELECT photo FROM employees The ratio of savings here is only 25 percent and represents the bottom end of the Northwind test results. Interestingly, if you add only a couple of traditional fields to the query, the ratio increases to 28 percent. The application shown in Figure 9-9 (included in this book's sample files) is a useful tool for fine-tuning the structure of the table and the queries for better serialization results. Deserializing Data Once the binary data has been deserialized, you hold an instance of the ghost class that must be transformed back into a usable DataTable object. Here's how the sample application accomplishes this: DataTable BinaryDeserialize(string sourceFile) 346

ong documents can be difficult to navigate and manage. Word s Outline view, as discussed in earlier chapters, makes it easy to create large documents. Fortunately, Word includes other tools that will help you create, review, and edit large documents. Many of these features also work well in a collaborative environment, where many people are working on the same document.

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{ BinaryFormatter bf = new BinaryFormatter(); StreamReader sr = new StreamReader(sourceFile); GhostDataTable ghost = (GhostDataTable) bf.Deserialize(sr.BaseStream); sr.Close(); // Rebuild the DataTable object DataTable dt = new DataTable(); // Add columns for(int i=0; i<ghost.colNames.Count; i++) { DataColumn col DataColumn(ghost.colNames[i].ToString(), dt.Columns.Add(col); } // Add rows for(int i=0; i<ghost.dataRows.Count; i++) { DataRow row = dt.NewRow(); row.ItemArray = (object[]) ghost.dataRows[i]; dt.Rows.Add(row); } dt.AcceptChanges(); return dt; } The information stored in the ghost arrays is used to add columns and rows to a newly created DataTable object. Figure 9-9 demonstrates the perfect equivalence of the objects obtained by deserializing a DataTable and a ghost class. Caution The ghost class used in the preceding sample code serializes the minimal amount of information necessary to rebuild the DataTable object. You should add new properties to track other DataColumn or DataRow properties that are significant in your own application. Note that you can't simply serialize the DataColumn and DataRow objects as a whole because none of them is marked as serializable. = new

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Type.GetType(ghost.colTypes[i].ToString()));

Contains licensing information about Microsoft Office Web Components. Negates the last action taken. Can be used multiple times. Moves and copies contents of cells or groups of cells. Enters a SUM formula in the active cell for values above or to the left. Sorts the column that contains that active cell in A Z or 1 9 order. Click the down arrow on the button to select another column to sort by. Sorts the column that contains that active cell in Z A or 9 1 order. Click the down arrow on the button to select another column to sort by. Activates AutoFilter buttons to filter data in the columns. If the workbook is connected to another data source, this retrieves the current data (see Connecting Web Parts to Data later in this chapter). Exports the workbook to Microsoft Excel. Opens the Commands and Options dialog box for formatting, modifying formulas, searching, and setting sheet options. Opens Microsoft Office 2003 Spreadsheet Component Help.

The contents of an ADONET DataSet object can be loaded from an XML stream or document for example, from an XML stream previously created using the WriteXml method To fill a DataSet object with XML data, you use the ReadXml method of the class The ReadXml method fills a DataSet object by reading from a variety of sources, including disk files, NET Framework streams, or instances of XmlReader objects In general, the ReadXml method can process any type of XML file, but of course the nontabular and rather irregularly shaped structure of XML files might create some problems and originate unexpected results when the files are rendered in terms of rows and columns In addition, the ReadXml method is extremely flexible and lets you load data according to a particular schema or even infer the schema from the data.

Building DataSet Objects The ReadXml method has several overloads, all of which are similar They take the XML source plus an optional XmlReadMode value as arguments, as shown here: public XmlReadMode ReadXml(Stream, XmlReadMode); public XmlReadMode ReadXml(string, XmlReadMode); public XmlReadMode ReadXml(TextReader, XmlReadMode); public XmlReadMode ReadXml(XmlReader, XmlReadMode); The ReadXml method creates the relational schema for the DataSet object according to the read mode specified and regardless of whether a schema already exists in the DataSet object The following code snippet is typical code you would use to load a DataSet object from XML: StreamReader sr = new StreamReader(fileName); DataSet ds = new DataSet(); dsReadXml(sr); srClose(); The return value of the ReadXml method is an XmlReadMode value that indicates the modality used to read the data This information is particularly important when no reading mode is specified or when the automatic default mode is set.

Word s Bookmark feature is a handy way to mark specific parts of your document. It enables you to return quickly to a marked location, rather than scroll through pages and pages of your document. To insert a bookmark in your document, position the cursor at the location you would like to mark and click Insert Bookmark, or you may use the Ctrl+Shift+F5 keyboard shortcut. In the Bookmark dialog box, shown in Figure 10-1, type a name for the bookmark. Click Add.

In addition to entering data directly into an Office Spreadsheet Web Part, you can connect to existing data sources. See Connecting Web Parts to Data later in this chapter for information about how to access existing data sources.

In either case, you don't really know how the schema for the target DataSet object has been generated Modes of Reading Table 9-4 summarizes the reading options available for use with the ReadXml method; allowable options are grouped in the XmlReadMode enumeration Table 9-4: XmlReadMode Enumeration Values Read Mode Description Auto Default option; indicates the most appropriate way of reading by looking at the source data DiffGram Reads a DiffGram and adds the data to the current schema If no schema exists, an exception is thrown 348.

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