TopXML SQL XML library : What is the usage of the XmlDataDocument?

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By	Sonu Kapoor
First Posted	02/20/2005
Times viewed	244

What is the usage of the XmlDataDocument?

Summary What is the usage of the XmlDataDocument?

The XmlDataDocument is mainly used to work with a dataset. Through that class you can manipulate the data stored in a dataset easily. All changes you make in the dataset class are made in the Xml and all changes in the xml are being made in the dataset. Here is a small example which adds a new SubCategory after the MainCategory node to the below XML.

Additional information
<%@ import namespace="System.Xml" %> <%@ import namespace="System.Xml.XPath" %> <%@ import namespace="System.Data" %> <%@ page language="C#" debug="true"%> <script runat="server"> void page_load(object sender, System.EventArgs e){ // Create a new data set and load the XML file DataSet ds = new DataSet(); ds.EnforceConstraints = false; ds.ReadXml(Server.MapPath("XmlDataDocumentAddElement.xml")); // Create a new XmlDataDocument object and pass the dataset // as a parameter XmlDataDocument xmlDoc = new XmlDataDocument(ds); // Select the required nodes XmlNode node; node = xmlDoc.DocumentElement.SelectSingleNode("/CategoryList/Category[@ID=01~/MainCategory"); // Create a new element XmlElement xmlSubCat = xmlDoc.CreateElement("SubCategory"); // Set the value for the new element xmlSubCat.InnerText = "XPath"; // Find the common parent of the MainCategory node XmlNode commonParent = node.ParentNode; // Insert the node commonParent.InsertAfter(xmlSubCat, node); // Store the file with the new element xmlDoc.Save(Server.MapPath("XmlDataDocumentAddElement.xml")); } </script>

Further additional information
<CategoryList> <Category ID="01"> <MainCategory>XML</MainCategory> <Description>This is a list my XML articles.</Description> <Active>true</Active> </Category> </CategoryList> The above code example adds the node also in the dataset. Here is the created XML file. <CategoryList> <Category ID="01"> <MainCategory>XML</MainCategory> <SubCategory>XPath</SubCategory> <Description>This is a list my XML articles.</Description> <Active>true</Active> </Category> </CategoryList>

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