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Design Phase
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The first phase of the life cycle is the design phase This is where you determine the objective of the application That is, what is the application going to do You then define all the features that will be necessary to reach the objective Let's say that you're a building a house In the design phase, you determine your housing needs and relay this to the architect The architect draws up a detail plan for the house based on your needs Your goal for the design phase is to develop a detail plan for building your application This plan must describe how both the user side and the server side look and work It is best to begin your design using a top-down approach First, determine what your application is going to do, such as accept an online order
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Building an ASPNET Web Page Application
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Next, focus on the information needed to achieve this objective That is, what information is necessary to place an order online Make a list and describe each piece of information by name, kind of information (eg, money, quantity, name, calculation), and source For example, you'll need to display product information on the screen before the customer places the order Typically, product information includes a product name, a product description, a product number, a price, and possibly a product picture This information is generated by the ASPNET engine using product data stored in a database Once you make a list of this information, then design the user interface A user interface is the client side of an application that the visitor uses to interact with your application The list of information is your guide to determine what HTML elements are needed to design the user interface For example, labels can be used to display a product name, a product description, a product number, and a price An image element is used to display a product picture Your user interface design must define how the user interacts with your web page Suppose you expect the visitor to place an order using your web page; you must then decide how they are going to place the order That is, what information must they enter, where do they enter this information, what button do they click to submit the order, and so on This is all part of the design phase
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TIP:During the design phase, focus on what you need and not how you are
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going to build it Building occurs in the development phase Your job is to describe the user interface and how it works the best way you can without building it This plan is then given to a developer to build, although in some situations you'll be both the designer and the developer
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During the design phase, you must specify what you want to happen on the server side of your application Remember from previous chapters that the server side is where the ASPNET engine processes requests and generates a dynamic web page that is sent to the visitor Therefore, you must explicitly itemize steps needed to process the request and generate a dynamic web page
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These steps depend on the nature of your application Some applications will require the ASPNET engine to retrieve data from a database and insert that data, such as product information, into a dynamic web page Other applications might require the ASPNET engine to access a non-web application, for instance, to verify login information provided by the visitor Whatever the process, it is your responsibility to list all the steps in the process so that a developer can write the code to have the ASPNET engine perform those steps The best way to specify a process is by using pseudocode Pseudocode is an informal language that is a mixture of plain English and a programming language Let's say that you want the process to verify login information provided by the visitor The ASPNET engine calls a non-web application to do the verification, and that application sends back an approval or rejection notice Here's the pseudocode that describes this process:
Read ID and password submitted by visitor Send ID and password to verification program if verification program approves then Dynamically create an approval web page and sent it to the visitor else Dynamically create a rejection web page and sent it to the visitor end if
Everything except the if elseend if is in plain English The if elseend if is part of a programming language that specifies a condition for making a decision If the condition is true, then one set of instructions is executed Another set of instructions is executed if the condition is false A developer translates pseudocode into a programming language that the ASPNET understands As a designer, you only need to describe every process as best as you can using pseudocode
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