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<%@ Page Explicit= True Language= VB Debug= True %> <html> <script runat= server > Sub OKButton_Click(Sender As Object, E As EventArgs) Dim UserAge, DogAge As Integer UserAge = AgeText DogAge = UserAge / 7 MessageText= If you were a dog, you d be & _ DogAge & years old End Sub </script> <body> <form runat= server > <h1>If You Were A Dog</h1> How old are you <br> <asp:textbox id= Age runat= server /> <asp:button text= OK onclick= OKButton_Click runat= server /><br> <asp:label id= Message runat= server /> </form> </body> </html>
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This code includes three new items: A <script> tag and a subroutine within it A new label control with its id attribute set to Message A new onclick attribute on the button control First, take a look at the new attribute on the button server control: <asp:button text= OK onclick= OKButton_Click runat= server /><br> The onclick attribute captures the event that happens when the user clicks this button How By specifying the name of a subroutine to execute when the event happens So, in this case, you write code in the OKButton_Click subroutine Then when the user clicks the OK button, the subroutine is called, and code there is executed If you re using Visual Web Developer 2005 Express, you can use a couple of different techniques to automatically create subroutines to handle an event You can simply double-click the button in Design view to switch to Source view and automatically create the Click event subroutine Or if you are already in Source view, you can use the drop-down list boxes at the top of the Editor window to select the button control and then select the Click event This also automatically creates the new subroutine For more information and step-by-step directions, see 4 The subroutine in Listing 10-2 accepts two arguments: Sender and E All subroutines that respond to system events receive these arguments You have to specify them here because that s what the event requires But you don t have to use them For now, you can ignore them First, you create a couple of integer variables Then, you assign a value to one of them The value is AgeText: UserAge = AgeText As you might expect, Age is an object, and Text is a property of the Age object But what does Age refer to Look at the textbox server control: <asp:textbox id= Age runat= server /> The id attribute is set to Age That enables you to refer to Age as an object from your ASPNET 20 code When you work with server controls, the server creates the objects for you automatically so that you can immediately access the control s properties In this case, the Age text box object s Text property holds the information in the textbox control The text in the textbox control is then placed in the UserAge variable
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The DogAge variable is then calculated by dividing UserAge by 7 Finally, the result is displayed: MessageText= If you were a dog, you d be & _ DogAge & years old This time, you refer to another object: Message Message is another server control It s the new label control in this listing: <asp:label id= Message runat= server /> A label control is a lot like a textbox control, except it s designed only for showing text You can t edit the text in a label In this case, you use the label to display the result of the calculation You simply assign a value, using & to stick the strings together with the variable DogAge
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Properties and methods are the primary ways you work with server controls on your page So, understanding which properties and methods are available for each control helps you understand what you can do with the controls I spend the next few chapters helping you do just that But before I dive into each control and its members, you should know a few things about properties and giving them values Not all of them work as simply as the label control s Text property But after you get the hang of these few variations, you can work with any property on any control without trouble! Don t skip these sections; otherwise, you might be baffled by the different ways properties are handled in subsequent chapters
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