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Remember that view state applies to all the values that change, not just the text displayed in the control. Tip For example, if you dynamically change the colors used in a label, you ll need to use view state even if you don t dynamically set the text. Technically, it s the control s responsibility to use view state, so it is possible to create a server control that doesn t retain certain values even if view state is enabled. This might be used to optimize performance in certain scenarios.

Although COM certainly facilitates the construction of software applications using a variety of different programming languages, the language-independent nature of COM was not as straightforward as one would hope Some of the complexity is due to the simple fact that applications that are woven together using diverse languages are completely unrelated from a syntactic point of view For example, JScript has a syntax much like C, while VBScript is a subset of VB6 The COM servers that are created to run under the COM+ runtime (a Windows OS feature which provides common services to custom code libraries [transactions, object lifetime, security, etc]) have an entirely different look and feel from the web-centric ASP pages that invoke them The result was a rather confused mishmash of technologies Furthermore, and perhaps more important, each language and/or technology has its own type system (that may look nothing like another s type system).

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To turn off view state for a single control, set the EnableViewState property of the control to False. To turn off view state for an entire page and all its controls, set the EnableViewState property of the page to False, or use the EnableViewState attribute in the Page directive, as shown here: <%@ Page Language="vb" EnableViewState="False" ... %>

Beyond the fact that each API ships with its own collection of prefabricated code, even basic data types cannot always be treated identically A CComBSTR in ATL is not quite the same as a String in VB6, both of which have nothing to do with a char* in C Given that each language has its own unique type system, COM programmers typically needed to be very careful with building public methods on public COM classes For example, if a C++ developer needed to create a method that returned an array of integers to a VB6 application, they would be up to their eyeballs in complex COM API calls to construct a SAFEARRAY structure, which could easily require dozens of line of code In the COM world, the SAFEARRAY data type is the only way to build an array that all COM frameworks understand.

Figure 9-6. Binding a list control to a data source field 4. You can use the same steps to bind a rich data control. Add a GridView to your page, and set the GridView.DataSourceID property to the same data source. You don t need to set any field information, because the GridView can display multiple fields. You ll see the column headings from your query appear on the design surface of your page immediately. 5. Run your page. Don t worry about executing the command or calling DataBind() on the page ASP.NET performs both of those tasks automatically. You ll see a data-bound page like the one in Figure 9-7.

If the C++ developer simply returned a native C++ array, VB6 would have no clue what to do with it Similar complexities could be found when building methods that manipulate simple string data, references to other COM objects, or even a trivial BOOLEAN value! To put it politely, COM programming is a very asymmetrical discipline..

Clearly, the great advantage of the data source controls is that they allow you to configure data binding at design time, without writing tedious code. Even better, the results of your selections appear (to a limited degree) in the Visual Studio designer so you can get a better idea of what your form will look like.

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