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omponent-based development encourages you to divide the logic in your application into discrete, independent blocks. Once you ve made the jump to custom classes, you can start creating modular web applications that are built with reusable units of code. But while these classes help work out thorny data access procedures or custom business logic, they don t offer much when it comes to simplifying your user interface code. If you want to create web applications that reuse a customized portion of user interface, you re still stuck rewriting control tags and reconfiguring page initialization code in several places. It doesn t have to be this way. ASP .NET includes tools for modularizing and reusing portions of user interface code that are just as powerful as those that allow you to design custom business classes. You have two main tools at your fingertips, both of which you ll explore in this chapter: User controls allow you to reuse a portion of a page by placing it in a special .ascx file. ASP .NET also allows you to make smart user controls that provide methods and properties and configure their contained controls automatically. Custom controls allow you to build a new control by inheriting from an ASP.NET control class. With custom controls, there is no limit to what you can do, whether it s adding a new property or tweaking the rendered HTML output.

Int32, Decimal, Single, Double, and all other basic numeric types DateTime, TimeSpan Char, Byte, and Boolean String Array

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o far, you ve dealt with only read-only data pulling some data from a database without altering it. In this chapter, you ll discover how to create pages that allow users to add, modify, and delete the contents of a database. At the core of these three operations are three SQL queries: INSERT, UPDATE, and DELETE. First, we ll look at modifying the data in separate pages that neatly wrap up the three different types of operations using a Command object. Then you ll see how to use a DataSet to make changes to tables. This chapter covers the following topics: How to use single-value and list Web controls to build a query sent directly to the database with a call to ExecuteNonQuery() or ExecuteScalar() How to validate data entered through Web controls to make sure no invalid changes are made How to use a DataSet to hold several different tables and propagate any changes back to the database in one call to Update() through the DataAdapter

Let s see some colors now! The Search Catalog feature has two separate interface elements that you need to implement. The first one is the place where the visitor enters the search string, shown earlier in Figure 5-1. This part of the UI will be implemented as a separate user control named SearchBox.ascx, which provides a text box and a check box for the visitor. The other part of the UI consists of the search results page (Search.aspx), which displays the products matching the search criteria (refer to Figure 5-2).

Equality and assignment operations work with the variable contents, not a reference. Equality and assignment operations work with the variable contents, not a reference. Equality and assignment operations work with the variable contents, not a reference. Equality and assignment operations appear to work with the variable contents, not a reference. Equality and assignment operations work with the reference, not the contents.

Whether you realize it at first, every piece of code in .NET exists inside a .NET type (typically a class). In turn, every type exists inside a namespace. Figure 3-3 shows this arrangement for your own code and the DateTime class. Keep in mind that this is an extreme simplification the System namespace alone is stocked with several hundred classes. This diagram is designed only to show you the layers of organization.

Of course, there s no reason why you can t use a DataSet just for displaying data in a page as well. In 6, you ll see how to use both a DataSet and a DataReader to supply read-only information to a page.

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