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The application consists of a DataGridView control that displays the data from the Employees.xml file. You can modify the data and click the Export as HTML Page button to save the data as an HTML file. The Load event of the form is shown in Listing 7-22. Listing 7-22. Creating an XmlDataDocument from an XML File XmlDataDocument doc = null; private void Form1_Load(object sender, EventArgs e) { DataSet ds = new DataSet(); ds.ReadXml(Application.StartupPath + @"\employees.xml"); doc = new XmlDataDocument(ds); dataGridView1.DataSource = ds.Tables[0]; } The code declares a class-level variable of type XmlDataDocument. The Load event of the form creates an instance of DataSet and reads the Employees.xml file into it by using ReadXml(). Then a new instance of XmlDataDocument is created by passing the DataSet we just created to its constructor. Thus our example constructs an XmlDataDocument by using a DataSet. The DataTable from the DataSet is then assigned as the DataSource of the DataGridView control. This way, the data from Employees.xml is available for editing. The Click event of the Export as HTML Page button is shown in Listing 7-23. Listing 7-23. Applying XSLT Transformations on XmlDataDocument private void button1_Click(object sender, EventArgs e) { XslCompiledTransform xslt = new XslCompiledTransform(); xslt.Load(Application.StartupPath + @"\employees.xslt"); XmlTextWriter writer = new XmlTextWriter(Application.StartupPath + @"\employees.html", null); xslt.Transform(doc, writer); writer.Close(); } The code creates an instance of the XslCompiledTransform class, and the XSLT style sheet is loaded by using its Load() method. Then an instance of XmlTextWriter is created to write the transformed data into an HTML file (Employees.html). The Transform() method of XslCompiledTransform is then called, and the XmlDataDocument and XmlTextWriter objects are passed to it as parameters. The Transform() method accesses the XML data from the XmlDataDocument class, applies the style sheet to it, and writes the transformed data by using XmlTextWriter.

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10. Add the following class, DataCashRequest (this class also requires using references to System.Net, System.Text, and System.IO): using using using using System.Xml.Serialization; System.IO; System.Net; System.Text;

13. Enter your credit card information (see Figure 5-5).

6. See Listing 6-2 for the complete markup of Employees.xslt. Also, make sure that you copy these files to the Bin\Debug folder of your project before you run the application. qr code reader

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namespace DataCashLib { [XmlRoot("Request")] public class DataCashRequest { [XmlElement("Authentication")] public AuthenticationClass Authentication = new AuthenticationClass(); [XmlElement("Transaction")] public TransactionClass Transaction = new TransactionClass(); public DataCashResponse GetResponse(string url) { // Configure HTTP Request HttpWebRequest httpRequest = WebRequest.Create(url) as HttpWebRequest; httpRequest.Method = "POST"; // Prepare correct encoding for XML serialization UTF8Encoding encoding = new UTF8Encoding(); // Use Xml property to obtain serialized XML data // Convert into bytes using encoding specified above and // get length byte[] bodyBytes = encoding.GetBytes(Xml); httpRequest.ContentLength = bodyBytes.Length; // Get HTTP Request stream for putting XML data into Stream httpRequestBodyStream = httpRequest.GetRequestStream(); // Fill stream with serialized XML data httpRequestBodyStream.Write(bodyBytes, 0, bodyBytes.Length); httpRequestBodyStream.Close(); // Get HTTP Response HttpWebResponse httpResponse = httpRequest.GetResponse() as HttpWebResponse; StreamReader httpResponseStream =

new StreamReader(httpResponse.GetResponseStream(), System.Text.Encoding.ASCII); // Extract XML from response string httpResponseBody = httpResponseStream.ReadToEnd(); httpResponseStream.Close();

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In the preceding example, we created an XmlDataDocument by using a DataSet, but you can also create an XmlDataDocument by using an XML document. In the latter case, you can use the Load() method of XmlDataDocument. This method works the same way as with the XmlDocument class (see 2). You can then use the loaded XML data in a relational manner with the help of the DataSet property of the XmlDataDocument class.

// Ignore everything that isn't XML by removing headers httpResponseBody = httpResponseBody.Substring( httpResponseBody.IndexOf("< xml")); // Deserialize XML into DataCashResponse XmlSerializer serializer = new XmlSerializer(typeof(DataCashResponse)); StringReader responseReader = new StringReader(httpResponseBody); // Return DataCashResponse result return serializer.Deserialize(responseReader) as DataCashResponse; } [XmlIgnore()] public string Xml { get { // Prepare XML serializer XmlSerializer serializer = new XmlSerializer(typeof(DataCashRequest)); // Serialize into StringBuilder StringBuilder sb = new StringBuilder(); StringWriter sw = new StringWriter(sb); serializer.Serialize(sw, this); sw.Flush(); // Replace UTF-16 encoding with UTF-8 encoding string xml = sb.ToString(); xml = xml.Replace("utf-16", "utf-8"); return xml; } } } }

11. Add the following class, DataCashResponse (which needs additional using references to System. Text and System.IO): using System.Xml.Serialization; using System.IO; using System.Text; namespace DataCashLib { [XmlRoot("Response")] public class DataCashResponse { [XmlElement("status")] public string Status;

Sometimes you may need to access the XML element belonging to a DataRow from the DataSet. This can be achieved by using the GetElementFromRow() method of XmlDataDocument. This method accepts a reference to a DataRow instance from the DataSet and returns an XmlElement corresponding to that row. The working of the GetElementFromRow() method will be clear when you develop the application shown in Figure 7-21.

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