Applied XML Programming for Microsoft .NET.pdf - Csbdu.in

Testing the XmlRecordsetWriter ClassFor .NET Framework applications, using the XmlRecordsetWriter class is no big deal.You simply instantiate the class and call its methods, as shown here:void ButtonLoad_Click(object sender, System.EventArgs e){// Create and display the XML documentCreateDocument("adors.xml");UpdateUI("adors.xml");}void CreateDocument(string filename){DataSet ds = LoadDataFromDatabase();XmlRecordsetWriter writer = newXmlRecordsetWriter(filename);writer.WriteRecordset(ds);}Figure 4-11 shows the output of a sample application that creates the XML file and thendisplays it in a text box on the form.Figure 4-11: An ADO XML Recordset object that has just been created and its contentsdisplayed in a text box on the form.The source DataSet object is fetched from the SQL Server Northwind database byexecuting the following query:SELECT employeeid, firstname, lastname FROM employeesThe XML file that is created in this way is successfully recognized by ADOdrivenapplications, as shown in Figure 4-12.146