Use XML In Asp.Net

.NET Framework has extensive support for working with XML Language. In the .NET framework, the support for XML documents includes:

• XML namespace:
• XML designer
• XML Web Server control
• XML DOM support

XML Namespace

The System.Xml namespace provides a Large set of classes for processing XML data.There Are more classes such as

• XmlTextReader: It 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: It 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. Syntax:
  
  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);

Please refer the below links

http://r4r.co.in/c1/01/tutorial/csharp/how_to_use_xml_in_asp.shtml

http://www.beansoftware.com/ASP.NET-Tutorials/Using-XML.aspx

http://www.w3schools.com/xml/xml_usedfor.asp
Thanks