Setting up the user interface

Let's begin with Default.aspx. Open Toolbox (remember, Ctrl+Alt+X) and then insert a Label control simply as a place to hold some output. Let's also place a TextBox control above the Label control. Grab a TextBox control, and drag and drop it into the page. Now, the last thing to do to set this up is to put a <br> tag at the end of the TextBox line. Our simple user interface is shown in the following screenshot:

Figure 5.3.1: Our simple user interface

Creating a method

Now switch to the Design view, and double-click on TextBox. This generates the event handler, and here you'll create your code. But first, right above it, we will create a method, as shown as follows. A method is simply a chunk of code. Usually, it has a very definite purpose that is expressed very clearly through the name of the method:

private static double GetIncreasedValue(double x)

Let's begin with some of the requirements. First, we start with private, and the fact that this is private...