The complete version of the Default.aspx.cs
file for this chapter, including comments, is shown in the following code block:
//using is a directive //System is a name space //name space is a collection of features that our needs to run using System; using System.Xml.Linq; using System.Linq; //public means accessible anywhere //partial means this class is split over multiple files //class is a keyword and think of it as the outermost level of grouping //:System.Web.UI.Page means our page inherits the features of a Page public partial class _Default : System.Web.UI.Page { protected void Button1_Click(object sender, EventArgs e) { //clear label on every button click so stuff does not accumulate sampLabel.Text = ""; //create a nice XML tree structure for searching: store is the //root, inside that is shoes, //and then under shoes are three different brands XElement store = new XElement("store", ...