Define the namespace

   
 
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Xml;
using System.Xml.Linq;
using System.IO;


public class MainClass{

   public static void Main(string[] args){   
      XDocument NewDoc = new XDocument(
            new XDeclaration("1.0", "utf-8", "yes"),
            new XElement("Root", "MyDoc"));

      XNamespace MyNS = "http://www.kutayzorlu.com/java2s/com/";

      NewDoc.Element("Root").Name = MyNS.GetName("Root");

      // Add an element that uses the namespace.
      NewDoc.Element(MyNS + "Root").Add(
         new XElement(MyNS + "Child1", "Some Data1 "),
         new XElement(MyNS + "Child2", 
            new XAttribute(
               XNamespace.Xmlns + "NewNS", 
               "http://www.kutayzorlu.com/java2s/com"), 
               "Some Data 2"));
   }
}

   
     


Add an element that uses the namespace

   
 

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Xml;
using System.Xml.Linq;
using System.IO;


public class MainClass{

   public static void Main(string[] args){   
      XDocument NewDoc = new XDocument(
            new XDeclaration("1.0", "utf-8", "yes"),
            new XElement("Root", "MyDoc"));

      XNamespace MyNS = "http://www.kutayzorlu.com/java2s/com/";

      // Add the namespace to the root node.
      NewDoc.Element("Root").Name = MyNS.GetName("Root");

      // Add an element that uses the namespace.
      NewDoc.Element(MyNS + "Root").Add(
         new XElement(MyNS + "Child1", "Some Data1 "),
         new XElement(MyNS + "Child2", new XAttribute(XNamespace.Xmlns + "NewNS", "http://www.kutayzorlu.com/java2s/com"),"Some Data 2"));

   }
}

   
     


Add the processing instruction

   
 

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Xml;
using System.Xml.Linq;
using System.IO;


public class MainClass{

   public static void Main(string[] args){   
      XDocument NewDoc = new XDocument(
            new XDeclaration("1.0", "utf-8", "yes"),
            new XElement("Root", "MyDoc"));
         // Add the processing instruction.
         NewDoc.AddFirst(new XProcessingInstruction(
            "xml-stylesheet", 
            "type='text/xsl' href='MyXSL.XSL'"));


   }
}

   
     


Add an attribute to the root node

   
 

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Xml;
using System.Xml.Linq;
using System.IO;


public class MainClass{

   public static void Main(string[] args){   
      XDocument NewDoc = new XDocument(
            new XDeclaration("1.0", "utf-8", "yes"),
            new XElement("Root", "MyDoc"));    
      // Add an attribute to the root node.
      NewDoc.Element("Root").Add(new XAttribute("MyAttr", "Attribute Value"));
   }
}

   
     


Add a comment to XDocument

   
 

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Xml;
using System.Xml.Linq;
using System.IO;


public class MainClass{

   public static void Main(string[] args){   
      XDocument NewDoc = new XDocument(
            new XDeclaration("1.0", "utf-8", "yes"),
            new XElement("Root", "MyDoc"));  
      // Add a comment.
      NewDoc.AddFirst(new XComment("This is a comment."));

      // Add another comment.
      NewDoc.Element("Root").Add(new XComment("This is another comment."));

      // Add a third comment.
      NewDoc.Add(new XComment("This is the third comment."));

      // Add some text.
      NewDoc.Element("Root").Add(new XText("This is some text."));
   }
}

   
     


Add the CData to XDocument

   
 

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Xml;
using System.Xml.Linq;
using System.IO;


public class MainClass{

   public static void Main(string[] args){   
      XDocument NewDoc = new XDocument(
            new XDeclaration("1.0", "utf-8", "yes"),
            new XElement("Root", "MyDoc"));  
      // Add the CData.
      NewDoc.Element("Root").Add(
            new XElement("CDataElement",
               new XCData("This is a CData Entry!")));

   }
}

   
     


Add to First to XDocument

   
 

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Xml;
using System.Xml.Linq;
using System.IO;


public class MainClass{

   public static void Main(string[] args){   
      XDocument NewDoc = new XDocument(new XDeclaration("1.0", "utf-8", "yes"),
            new XElement("Root", "MyDoc"));  
      NewDoc.AddFirst(new XDocumentType(
               "MyDocType", "MyPubID", 
               "MySysID", "ThisInternalSubset"));


   }
}