how to make qr code generator in vb.net Part 1: Understanding Microsoft Access in .NET framework

Creating Code 128 Code Set A in .NET framework Part 1: Understanding Microsoft Access

Part 1: Understanding Microsoft Access
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Designing Your Database Application
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Step 3: Identifying Data Elements
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After you develop your task list, perhaps the most important design step is to list the bits of data the data elements required by each task and the changes that will be made to that data. A given task will require some input data (for example, a price to calculate an extended amount owed on an order); the task might also update the data. The task might delete some data elements (remove invoices paid, for example) or add new ones (insert new order details). Or the task might calculate some data and display it, but not save the data anywhere in the database.
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Step 4: Organizing the Data
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After you determine all the data elements you need for your application, you must organize the data elements by subject and then map the subjects into tables in your database. A subject is a person, place, thing, or action that you need to track in your application. Each subject normally requires several data elements individual fields such as name or address to fully define the subject. With a relational database system such as Access, you use a process called normalization to help you design the most efficient and most flexible way to store the data.
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See the section Database Design Concepts, page 67, for a simple method of creating a normalized design.
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Step 5: Designing a Prototype and a User Interface
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After you build the table structures needed to support your application, you can easily mock up the application flow in forms and tie the forms together using simple macros or Microsoft Visual Basic event procedures. You can build the actual forms and reports for your application on screen, switching to Form View or Print Preview periodically to check your progress. If you re building the application to be used by someone else, you can easily demonstrate and get approval for the look and feel of your application before you spend time writing complex code that s needed to actually accomplish the tasks. (Parts 3 and 4 of this book show you how to design and construct forms and reports for desktop applications and client/server (project) applications, respectively; Part 5 shows you how to use Visual Basic to link forms and reports to build an application.)
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Step 6: Constructing the Application
For very simple applications, you might find that the prototype is the application. Most applications, however, will require that you write code to fully automate all the tasks you identified in your design. You ll probably also need to create certain navigation forms that facilitate moving from one task to another. For example, you might need to construct forms that provide the road map for your application. You might also need to build dialog forms to gather user input to allow users to easily filter the data they want to use in a particular task. You might also want to build custom menus for most, if not all, of the forms in the application. 55
Part 00: Part Title
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Part 1: Understanding Microsoft Access
Microsoft Office Access 2003 Inside Out
Step 7: Testing, Reviewing, and Refining
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Part 00: Part Title
As you complete various components of your application, you should test each option that you provide. When you automate your application using Visual Basic, you ll have many debugging tools at your disposal to verify correct application execution and to identify and fix errors. Tip Get feedback from your users If at all possible, you should provide completed portions of your application to users so that they can test your code and provide feedback about the flow of the application. Despite your best efforts to identify tasks and lay out a smooth task flow, users will invariably think of new and better ways to approach a particular task after they ve seen your application in action. Also, users often discover that some features they asked you to include are not so useful after all. Discovering a required change early in the implementation stage can save you a lot of time reworking things later. The refinement and revision process continues even after the application is put into use. Most software developers recognize that after they ve finished one release, they often must make design changes and build enhancements. For major revisions, you should start over at Step 1 to assess the overall impact of the desired changes so that you can smoothly integrate them into your earlier work.
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