Chapter review

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;
//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)
    {
        int x = 25, y = 34;//declare and set two variables
        sampLabel.Text = $"x={x}, y={y}";//display variables
        GenMethods.Swap (ref x, ref y);//swap values
        sampLabel.Text += $"<br>x={x}, y={y}";//display swapped values
     ...