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At the heart of the code to add new information to a database is the SQL INSERT query. Although it may seem otherwise, sending an INSERT query to a database is the only way to do this. Compared to the complexities of the SELECT query, the INSERT query is quite simple. INSERT [INTO] <table name> [ (column list) ] VALUES ( column value list ) The query doesn t need to be split over three lines, but that format makes it easier to see that it has six pieces: The keyword INSERT denotes the action to the database. The optional keyword INTO makes the query more readable. The table name identifies the table to which you re adding information. The (comma-separated) column list names the columns in the new row to which you re giving values. Although this isn t required, it is a good idea to specify it. It makes the query easier to follow and can reduce the risk of problems when you make changes to the database structure. The keyword VALUES separates the column list from the column value list. The (comma-separated) column value list contains a value for each of the columns in the column list for the new row. The number of the items in the column list should equal the number of items in the column value list and be ordered in the same way. Thus, the first column named in the column list will be filled with the first value in the column value list, the second with the second, and so on. Each value can be one of the following:

So far, you ve seen how user controls are generally used for aggregate groups of controls with some added higher-level business logic, while custom controls allow you to create new controls based on existing controls in the .NET Framework, or create entirely new controls by generating the HTML output from scratch. You ll also find that user controls are generally quicker to create, easier to work with in a single project, and simpler to program. Custom controls, on the other hand, provide extensive low-level control features you haven t even considered in this chapter, such as templates and data binding. One technique you haven t considered is composite controls custom controls that are built from other controls. Composite controls are a little bit closer to user controls, because they render their user interface at least partly from other controls. For example, you might find that you need to generate a complex user interface using an HTML table. Rather than write the entire block of HTML manually in the Render() method (and try to configure it based on various higher-level properties), you could dynamically create and insert a Table web control. This pattern is quite common with ASP .NET server controls for example, it s logical to expect that advanced controls such as the Calendar and DataGrid rely on simpler table-based controls such as Table to generate their user interfaces.

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Generating composite controls is quite easy. All you need to do is derive from a control class such as Control or WebControl, override the CreateChildControls() method, create the control objects you want to use, and add them to the Controls collection of your custom control. The following example creates a grid of buttons, based on the Rows and Cols properties. Figure 25-17 shows a simple test page for this control.

Note You can test caching to make sure it actually works by either placing breakpoints in code (the code shouldn t execute at all when caching is enabled) or even by temporarily stopping SQL Server and then browsing through pages that were stored in cache (although for this to work, you ll need to implement caching on all the controls that perform data access).

not to record the answers given to it. It would be a huge waste of resources to rebind the data every time the page was posted back to the Web server, especially if the page were complex. It would also lose the values the user had entered onto the page if it were posted back, because the rebinding would write over them. This is obviously not ideal. We ll look at how to manage when the data binding occurs in this chapter s examples.

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