For review, 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.Collections.Generic; //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) { sampLabel.Text = "";//clear label every time Quad sqr = new Square("John",4);//make a square Quad rect = new Rectangle("Bob", 2, 5);//make a rectangle Quad rect2 = new Rectangle("Jerry", 4, 5);//make another rectangle //stick all these shapes into a list of quads List<Quad> lst = new List...