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To perform an XML query, you must use the SqlCommand.ExecuteXmlReader() method. This method returns an XmlReader with the results of your query as an XML fragment. You can move through the XmlReader one node at a time in a forward-only direction in the same way you use the XmlTextReader. In fact, XmlTextReader derives from XmlReader. Here s the code needed to retrieve and display a customer list on a web page: ' Define the command. Dim customerQuery As String = "SELECT FirstName, LastName FROM Employees FOR XML AUTO, ELEMENTS" Dim con As New SqlConnection(connectionString) Dim com As New SqlCommand(customerQuery, con) ' Execute the command. Dim str As New StringBuilder() Try con.Open() Dim reader As XmlReader = com.ExecuteXmlReader() Do While reader.Read() ' Process each employee.

Reads an XML schema from a file or a TextReader, XmlReader, or Stream object and uses it to configure the structure of the DataSet. Reads an XML document with DataSet contents from a file or a TextReader, XmlReader, or Stream object and uses it to infer what structure the DataSet should have. This is an alternate approach to using the ReadXmlSchema() method, but it doesn t guarantee that all the data type information is preserved.

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For example, the following code retrieves the title of each DVD in the document: // Load the XML file. string xmlFile = Server.MapPath("DvdList.xml"); XmlDocument doc = new XmlDocument(); doc.Load(xmlFile); // Find all the <Title> elements anywhere in the document. StringBuilder str = new StringBuilder(); XmlNodeList nodes = doc.GetElementsByTagName("Title"); foreach (XmlNode node in nodes) { str.Append("Found: <b>"); // Show the text contained in this <Title> element. str.Append(node.ChildNodes[0].Value); str.Append("</b><br />"); } lblXml.Text = str.ToString(); Figure 12-3 shows the result of running this code in a web page.

If (reader.Name = "Employees") AndAlso (reader.NodeType = XmlNodeType.Element) Then reader.ReadStartElement("Employees") str.Append(reader.ReadElementString("FirstName")) str.Append(" ") str.Append(reader.ReadElementString("LastName")) str.Append("<br />") reader.ReadEndElement() End If Loop reader.Close() Finally con.Close() End Try XmlText.Text = str.ToString() Of course, life gets much more interesting when you combine an XML query with some of the other standards you ve seen in this chapter, such as XPath searching or XSL transformation. These techniques aren t for everyone, but they do give you the ability to transform your data into virtually any XML representation.

.NET 2.0 adds support for XML directly to the DataTable class. This means you can use the ReadXml(), WriteXml(), ReadXmlSchema(), and WriteXmlSchema() methods of the DataTable to read or write XML for a single table in a DataSet.

Figure 12-3. Searching for information in an XML document You can also search portions of an XML document by using the method XmlElement.GetElementsByTagName() on a specific element. In this case, the XmlDocument searches all the descendant nodes looking for a match. To use this method, first retrieve an XmlNode that corresponds to an element and then cast this object to an XmlElement. The following example demonstrates how to use this technique to find the stars of a specific movie: // Load the XML file. string xmlFile = Server.MapPath("DvdList.xml"); XmlDocument doc = new XmlDocument(); doc.Load(xmlFile); // Find all the <Title> elements anywhere in the document. StringBuilder str = new StringBuilder(); XmlNodeList nodes = doc.GetElementsByTagName("Title"); foreach (XmlNode node in nodes) { str.Append("Found: <b>");

Summary

Using the XML methods of the DataSet is quite straightforward, as you ll see in the next example This example uses two GridView controls on a page The first DataSet is filled directly from the Employees table of the Northwind database (The code isn t shown here because it s similar to what you ve seen in the previous chapters) The second DataSet is filled using XML Here s how it works: once the DataSet has been created, you can generate an XML schema file describing the structure of the DataSet and an XML file containing the contents of every row The easiest approach is to use the WriteXmlSchema() and WriteXml() methods of the DataSet These methods provide several overloads, including a version that lets you write data directly to a physical file.

As with breakpoints, any custom tasks you add by hand are stored in the hidden solution files. This makes them fairly fragile if you rename or move your project, these tasks will disappear without warning (or without even a notification the next time you open the website).

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