Beginning Web Development, Silverlight, and ASP.NET AJAX

CHAPTER 3 ■ WEB FORMS WITH ASP.NET 43
Next, be sure to use the Properties window to give your controls some friendly
names. The names used in this example are shown in Table 3-1. You’ll see what they look
like in HTML in Listing 3-3.
Table 3-1. Naming Your HTML Controls
Control
First Number TextBox
Second Number TextBox
First radio button (Add)
Second radio button (Subtract)
Submit button
Result TextBox
Name
txtFirst
txtSecond
optOption
optOption (using the same name groups the radio buttons)
btnSubmit
txtResult
If you aren’t familiar with HTML forms code, a few things may seem a little quirky,
particularly when dealing with the radio buttons. To create a group of radio buttons
where only one is selectable, use the name property and set each one to the same value.
So, as you can see in Listing 3-3, each radio button is called optOperation. You distinguish
them from each other using the value property. In this listing, you can see that they contain
the values Add and Subtract, respectively.
Listing 3-3. Your HTML Form
Untitled Page
First Number