Both SAX and DOM are used to parse the XML document. Both has advantages and disadvantages and can be used in our programming depending on the situation

SAX:

1. Parses node by node

2. Doesnt store the XML in memory

3. We cant insert or delete a node

4. Top to bottom traversing

DOM

1. Stores the entire XML document into memory before processing

2. Occupies more memory

3. We can insert or delete nodes

4. Traverse in any direction.

If we need to find a node and doesnt need to insert or delete we can go with SAX itself otherwise DOM provided we have more memory.

DOM Loads whole document into memory.So it requires lot of memory.
Not recommended for large XML Document.Using DOM you can traverse thru an XML document.
To parse XML in .NET enviornment using Document object model,use XmlDocument and XmlElement. These classes are available in System.Xml namespace

Using this classes,we can traverse an XML document and add,modify its element.

Creating XmlDocument
XmlDocument newXmlDoc = new XmlDocument();
Load Xml Document
newXmlDoc.Load(XmlFileName);
To Create Element
XmlElement newXmlElement = newXmlDoc.CreateElement("NEWELEMENT");
XmlElement newXmlMain = newXmlDoc.CreateElement("MAIN");
To Add Child
newXmlMain.AppendChild (newXmlElement);
Save Document
newXmlDoc.Save();



2.Simple API for XML (SAX)

Load/Read portion of XML document as needed.This is the best option when memory is limited.Cannot traverse backward thru an XML file.Speed is very less compare to DOM

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