![]() Suppose, however, that the controls to be displayed form too many permutations to place all the possibilities in group boxes. In many scenarios, this suffices because the controls collections belong to either one set or another. In this case, the group boxes are made visible and invisible as appropriate. Granted, you can accomplish this by creating group boxes or panels to act as containers for the appropriate controls created at design time. Checking the first one displays one set of controls underneath, and checking the second one displays a completely different set. For example, two check boxes may appear on a screen. Perhaps the most common use of data-driven programming is found when user controls are instantiated at runtime depending on selections made by the user. Then, whenever the accounts receivable form is displayed, it will include a delivery-truck field ready for data entry. Using data-driven programming techniques, you can let the user define a text box (or a combo box) for entry and storage of a truck number, position it on the accounts receivable screen, and establish rules for validating the data entered into it. ![]() Suppose the user's business model requires that each invoice be associated with a given delivery truck, but no delivery truck field is available. For example, an accounting system may have a data-entry form for entering invoices. A more common use of these techniques is found in off-the-shelf applications that give you some level of customization that the software publisher couldn't foresee. ![]() Normally, you'll never need to use data-driven programming in such an extensive fashion. Each of the data elements may require data validation that's written in C# or VB.NET source code and compiled at runtime to check the data and provide feedback to those performing data entry to the system. You must dynamically generate data tables and drag and drop controls on a form. It is, in effect, a scaled-down version of the Visual Studio IDE. ![]() Users of a LIMS system need to create definitions for various data elements they require in the process of laboratory research. A Laboratory Information Management System (LIMS) system is one such type of application. Data-driven development focuses on storing application structures in a database and deriving application functionality from the data structure itself, though few applications are entirely data-driven.
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