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late binding, you should use early binding as much as possible when you are creating your objects. By setting Option Strict to On (our recommendation), you are forced to bind your objects early.
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Listing 3.5 Early binding vs. late binding
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'VB.NET Dim ds As System.Data.DataSet ds = New System.Data.DataSet 'Early binding
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Dim oGeneric As Object 'Late binding oGeneric = New System.Data.DataSet //C# System.Data.DataSet ds; //Early binding ds = new System.Data.DataSet Object oGeneric; //Late binding oGeneric = new System.Data.DataSet;
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Server controls offer a lot of benefits to VB 6.0 developers because they provide the familiar event-driven object model in ASP.NET. You declare these controls with XML tags, and they contain properties and methods similar to those for controls in Windows Forms applications. They do carry a little more overhead than traditional HTML controls because they must be rendered and by default store their state in ASP.NET s ViewState property. Server control rendering and ViewState will degrade performance if not optimized correctly. Let s take a closer look.
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ViewState Server control rendering is handled automatically by ASP.NET. It provides up-level (modern W3C compliant) and down-level (older browser versions) browser support so that you don t have to create multiple versions of a page to be viewed by different versions of browsers. A good example is viewing the mobile calendar control with Internet Explorer versus viewing it on a wireless web phone. In Internet Explorer, it renders as HTML; when viewed by the phone s browser it renders as WAP. The HTML version of the output is simply a calendar that is displayed in a table; you can scroll through the table and select a date. When you view the same page using a wireless web-enabled phone, the calendar control takes on a different look, which is more text based than HTML based. The functionality is fundamentally the same, with an interface that is better suited to the smaller display of the phone. Rendering is one of the most powerful features of ASP.NET, and saves you a lot of time in your page development and interaction with a variety of browsers and devices. One of the most overlooked performance aspects of server controls is their ability to store information in ViewState. ViewState is a new property of the ASP.NET 45
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object model and is similar to the Session object, with the exception that ViewState is stored with the output of the page and the Session state is stored within the context of the web server (by default). ViewState is a useful client-side statemanagement tool because users can t turn ViewState on and off as they can with cookies. As shown in the code snippet that follows, values that are stored in ViewState are encrypted and stored in a hidden HTML control named __ViewState that is pushed down to the browser.
<input type="hidden" name="__VIEWSTATE" value="dDwtMTcxNDc4NjUzNzs7PkDvau75jhobsJOneuvUhbTG/g60" />
By default, most controls store their state information (i.e., properties) in ViewState, which can be expensive. Let s take the example of populating a DataRepeater control, which has four labels and four text boxes that will be populated with data in a database. For each line item that is retrieved from the database, eight controls will use ViewState to store their properties as the page is being output. This will dramatically increase the number of bytes that are pushed to the browser, which will make your page render slowly, thus decreasing performance. If the data that is displayed is read-only, you should set the EnableViewState property to False for all of your controls, so that your code will not store the state of the controls in ViewState. This boosts the performance of your page and reduces the amount of data that must travel to the browser. You can monitor the size of ViewState by using the ASP.NET Tracing feature. To turn on tracing for your page, add a <%@ Page Trace="true" %> directive to your page in the HTML designer. You can find the size of ViewState in the right-hand column of the Control Tree section of the trace output, as shown in figure 3.2. The trace output helps you determine how many bytes that each control uses in ViewState. By setting every control s EnableViewState property to False, you significantly reduce the size of ViewState (actually, the controls will not take up any space in ViewState, so the number of bytes in the ViewState that the controls make up will be 0). 3.3.2 Validation The .NET Framework also includes several validation controls that help you perform client-side validation without having to write JavaScript or VBScript. These controls are: RequiredFieldValidator CompareValidator RangeValidator RegularExpressionValidator CustomValidator
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