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In 7, you learned that DataSet objects can be serialized as XML documents. While serializing a DataSet object, we used an XmlWriteMode enumeration to specify how the data is to be written. Now, one of the options of XmlWriteMode was DiffGram, which persisted the DataSet contents in DiffGram format. Imagine that you have such a DiffGram containing inserts, updates, and deletes and you want to save these changes back to the database. One way to do this is to use DataSet and SqlXmlAdapter, which you ve already seen. There is another technique that also involves the SqlXmlCommand class. The SqlXmlCommand class can come in handy if you have a raw DiffGram that is not necessarily loaded in a DataSet. To illustrate the use of the SqlXmlCommand class, you need to develop an application like the one shown in Figure 10-8. The application consists of a DataGridView control for displaying all the records from the Employees table. There are two buttons: Save DiffGram and Update DiffGram. The former saves the contents of the DataSet to a disk file in DiffGram format. The latter button reads the previously saved DiffGram and updates the database.

Table 10-3. Open Source Parsers for Different Types of Documents (continued)

Notice that the exposed web method is called doCToF, as this is what you defined on the interface. Also, when you select doCToF to call up its test page, you ll see that you can enter the value for nC (see Figure 9-20).

Figure 10-8. Application for updating DiffGrams The Load event handler of the form contains the code shown in Listing 10-27. Listing 10-27. Filling a DataSet string strConn = @"Provider=SQLOLEDB;server=.; database=northwind;user id=sa;password=sa"; DataSet ds = new DataSet(); private void Form1_Load(object sender, EventArgs e) { SqlXmlCommand cmd = new SqlXmlCommand(strConn); cmd.RootTag = "ROOT"; cmd.CommandText = "Employees"; cmd.CommandType = SqlXmlCommandType.XPath; cmd.SchemaPath = Application.StartupPath + @"\employees.xsd"; SqlXmlAdapter da = new SqlXmlAdapter(cmd); da.Fill(ds); dataGridView1.DataSource = ds.Tables[0].DefaultView; } The code should be familiar to you, as you used it in previous examples. It simply populates a DataSet by using the SqlXmlAdapter class. The DataSet acts as the DataSource for the DataGridView control. The code that saves this DataSet as a DiffGram goes in the Click event of the Save DiffGram button and is shown in Listing 10-28.

Based on xpdf, there is a utility called pdftohtml that can translate PDF files into HTML files. This is also not a Java application (http://pdftohtml.sourceforge.net/). JPedal (www.jpedal.org) is a Java API for extracting text and images from PDF documents. Jakarta Apache POI has an early development-level Microsoft Word parser for versions of Word from Office 97, 2000, and XP (http://jakarta.apache.org/poi/). Simple Text Extractor Library (www.textmining.org) extracts text from Word 6.0, 97, 2000, XP and , 2003.documents with a Java API. Jakarta Apache POI is an excellent Microsoft Excel parser for versions of Excel from Office 97, 2000, and XP (http://jakarta.apache.org/poi/).

Clicking Invoke will now call the workflow and convert the input value from centigrade to Fahrenheit, returning the answer in an XML-encoded double. This example shows how straightforward it is to use WF to create a workflow and expose it as a web service. It s worth playing and experimenting with, as, particularly for large complex transactions, you can drastically reduce the amount of code that you have to write and encapsulate business processes in easy-to-manage redistributable libraries that can be published as web services or hosted within web applications.

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