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Responding to the User s Answer in .NET framework
Responding to the User s Answer
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<%@ Page Explicit= True Language= VB Debug= True %> <html> <body> <h1>So Ya Wanna Be A Gazillionaire</h1> The Question Was:<br> <b>Who was the second man to walk on the moon </b><br> <br> <% Dim Chosen As String Chosen = RequestQueryString( Answer ) Select Case Chosen Case Armstrong ResponseWrite( No, sorry! Neil Armstrong was actually ) ResponseWrite( the <i>first</i> man to walk on the ) ResponseWrite( moon ) Case Collins ResponseWrite( No, sorry! Michael Collins never ) ResponseWrite( actually made it to the moon s surface ) Case Aldrin ResponseWrite( Yes! You re right! Edwin Aldrin, Jr ) ResponseWrite( was the second man to walk on the moon ) Case Lightyear ResponseWrite( Nope You ve been watching way too ) ResponseWrite( many Disney movies ) End Select %> </body> </html> You retrieve the value from the URL line by using the QueryString property of the Request object Inside the parentheses after QueryString, you put the name that you ve given the information QueryString retrieves the value from the URL line and enables you to store the information in a string variable named Chosen
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9: Cool Stuff You Can Do with ASPNET 20 Objects
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A Select Case statement then uses this value to decide how to respond A different response is provided for each possible answer ResponseWrite lines are used to put the text on the page (For information on Select Case, see 6) If you re interested in finding out more about the capabilities of the Request and Response objects, check out Bonus 4 on the CD There you can find: How to creating and retrieving browser cookies The RequestBrowser object that lets you find out what the user s browser is and what it s capable of A list of Request object properties that provide interesting information
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The Application and Session Objects: More Variable Scope Options
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The Application and Session objects work similarly, and you use them for similar tasks The Application object holds information about the ASPNET application The Session object keeps track of each person who accesses the application, individually Both objects are always available to your code you don t need to instantiate them
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The application versus the session
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To explain the difference between the Application and Session objects, here s an example The application: Imagine your Web server has a cool real-estate ASPNET application that enables users to look at a variety of homes, pick one, and then calculate what the mortgage payment would be if they bought it Only one copy of this application exists on the Web server The application starts up the first time someone accesses a page for that application It doesn t end until the Web server is shut down That s the Application object s domain: the entire application for its entire life The session: The session is much different Suppose Sparky logs on to your real-estate application and begins looking through the homes Soon after, Judd pulls up a page and begins looking at houses, too Now, two different people are running
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Part IV: Classy Objects and Methodical Properties
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the same application You don t have two different applications, but you do have two different sessions Each time a new person accesses your ASPNET application, a new session is created If Sparky gives up for the night and comes back tomorrow, he will be in a different session from the one he was in previously
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It s a bird It s a plane No, it s a super-global Session variable!
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After you ve experimented with ASPNET pages for a while, you ll find yourself wishing for a super-global variable a variable that keeps its value from one page to the next What you really want is a Session variable: Session( HouseCost ) = 175000 This code creates a new variable called HouseCost and assigns it the value 175000 If the variable already exists, this code just changes its value This variable is a session-level variable that your code can access from any page as long as the current user continues to use this application You access a Session variable in the same way: If Session( HouseCost ) > 150000 Then Unlike variables declared with Dim, Session variables don t have a specified data type They get their data type from the information you store in them Because you don t actually declare Session variables (you just begin using them), misspelling a variable name can confuse ASPNET into thinking you re trying to create another variable The compiler has no way of catching this kind of error with Session and Application variables, so be careful!
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