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How you implement data binding depends on how you re accessing the database (are you using a SqlDataSource or writing code to access the database ), how much data you want to bind, and to which Web controls you want to bind the data. However, although there are many variations in data-binding techniques, they all fall into one of the following three categories: Binding single columns to the properties or value of a Web control. This is often known as inline binding. Binding a list of values (one column in a table) to a Web control. For convenience, I ll call this list binding. Binding a table of values to a Web control. For convenience, I ll call this table binding. In this chapter, we ll explore inline binding and list binding. Table binding is covered in the next chapter. But before we look at the specifics for each technique, let s review the general process for data binding with code, how data binding works with the SqlDataSource, and the Web controls that can be data-bound.

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If you re using Visual Studio, all your code will automatically be placed in a projectwide namespace. Tip By default, this namespace has the same name as your project. For more information, refer to 4, which tackles Visual Studio in detail.

VaryByControl: Used to vary the output cache depending on the values of server-side controls contained in the control or page being cached..

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When accessing the database in code, the process for adding a data-bound Web control is as follows: 1. Add a data-aware Web control to the page. 2. Associate a source of data with the Web control using the DataSource property. 3. Call DataBind() on the Web control or on the Page. All the examples in 4 followed these three steps with the barest minimum of code, binding the query results to a GridView object: GridView1.DataSource = myCommand.ExecuteReader(); GridView1.DataBind(); Calling DataBind() seems straightforward, but there s one catch: on what object Every Web control implements this interface because it must as a derivative of its parent class, System.Web.UI.Control. A call to DataBind() on a Web control will also call DataBind() on any Web controls contained within it. So, you could call it on a Label, and just that particular binding would occur. On the other hand, you could call Page.DataBind(), and the command would also filter down to every Web control on the page. You need to also consider a second issue here. Should a page rebind to a data source each time a page posts back Consider a page containing a lot of Web controls populated by binding RadioButtonList controls, CheckBox controls, and other elements to a data source with the eventual aim to update the user s answers back to the database. You don t need to bind the Web controls to the data source more than once, because its purpose is purely to set up the page,

Having to type long, fully qualified names is certain to tire your fingers and create overly verbose code. To simplify matters, it s standard practice to import the namespaces you want to use. When you import a namespace, you don t need to type the fully qualified type names. Instead, you can use any types in that namespace as though they were defined locally. To import a namespace, you use the Imports statement. These statements must appear as the first lines in your code file, outside of any namespaces or classes: Imports MyCompany.MyApp Consider the situation without importing a namespace: Dim salesProduct As New MyCompany.MyApp.Product() It s much more manageable when you import the MyCompany.MyApp namespace. Once you do, you can use this shortened syntax instead: Dim salesProduct As New Product() Importing namespaces is really just a convenience. It has no effect on the performance of your application. In fact, whether you use namespace imports, the compiled IL code will look the same. That s because the language compiler will translate your relative class references into fully qualified class names when it generates an EXE or DLL file.

You might wonder what gives you the ability to use the class library namespaces in a .NET program. Are they hardwired directly into the language The truth is that all .NET classes are contained in assemblies. Assemblies are the physical files that contain compiled code. Typically, assembly files have the extension .exe if they are stand-alone applications, or .dll if they re reusable components.

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