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 System;//needed for array, Convert, and Converter
delegate double CompareValues(double x, double y);//delegate for defining expression bodied lambda
public partial class _Default :System.Web.UI.Page
{
    double FromStringToDouble(string s) => Convert.ToDouble(s);//expression bodied function member
    protected void Button1_Click(object sender, EventArgs e)
    {
        //split entries into array of strings
        string[] vals = TextBox1.Text.Split(new char[] { ',' });
        //line 10 below converts all strings to doubles using the 
        //vals array, and a new Converter object
        //which really just calls FromStringToDouble
        double[] doubleVals = 
        Array.ConvertAll(vals, new Converter<string, double>(FromStringToDouble));
        //lines 13-17 define the expression bodied lambda, this one compares...