The System.Xml namespace provides a rich set of classes for processing XML data. The commonly used classes for working with XML data are:
XmlTextReader: Provides forward only access to a stream of XML data and checks whether or not an XML document is well formed. This class neither creates as in-memory structure nor validates the XML document against the DTD. You can declare an object of the XmlTextReader class by including the System.Xml namespace in the application. The syntax to declare an object of this class is as follows:
XmlTextReader reader = new XmlTextReader("XML1.xml");
It is important to note that the .xml file you pass as an argument to the constructor of the XmlTextReader class exists in the \WINNT\System32 folder.
XmlTextWriter: Provides forward only way of generating streams or files containing XML data that conforms to W3C XML 1.0. If you want to declare an object of the XmlTextWriter class, you must include the System.Xml. The syntax to decare an object of this class is as follows:
XmlTextWriter writer = new XmlTextWriter(Response.Output);
Here Response.Output represents an outgoing HTTP response stream to which you want to send the XML data.
XmlDocument: Provides navigating and edinting features of the nodes in an XML document tree. XmlDocument is the most frequently used class in ASP.NET applications that use XML documents. It also supports W3C XML DOM. XML DOM is an in-memory representation of an XML document. It represents data in the form of hierarchically organized object nodes and allows you to programmatically access and manipulate the elements and attributes present in an XML document.
XmlDocument doc = new XmlDocument();
XmlDataDocument: Provides support for XML and relational data in W3C XML DOM. You can use this class with a dataset to provide relational and non-relational views of the same set of data. This class is primarily used when you want to access the functions of ADO.NET. The syntax to declare an object of this class is as follows:
DataSet ds=new DataSet();
XmlDataDocument doc=new XmlDocument(ds);
There are a number of reasons to use XmlDataDocument:
It gives you the freedom to work with any data by using the DOM.
There is synchronization between an XmlDatadocument and a DataSet, and any changes in one will be reflected in the other.
When an XML document is loaded into an XmlDatadocument, the schema is preserved.
You need to include System.Xml namespace.
XmlPathDocument: Provides a read-only cache for XML document processing by using XSLT. This class is optimizied for XSLT processing and does not check for the conformity of W3C DOM. For this reason, you can create an instance of this class to process an XML document faster. To create an instance of the XPathDocument class, you need to include the System.Xml.XPath namespace in the application. The Syntax to declare an object of this class is as follows:
XmlPathDocument doc=new XmlPathDocument("XML1.xml");
XmlNodeReader: Provides forward-only access to the data represented by the XmlDocument or XmlDataDocument class. If you want to create an instance of the XmlNodeReader class, you need to include the System.Xml namespace. The syntax to declare an object of this class is as follows:
XmlDocument doc=new XmlPathDocument();
XmlNodeReader reader=new XmlNodeReader(doc);
XslTransform: Provides support for a XSLT 1.0 style sheet syntax that enables you to transform an XML document by using XSL style sheets. If you want to create an instance of the XslTransform class, you need to include the System.Xml.Xsl namespace in the application.
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