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Part III: Enhancing the Interface and User Experience in Visual Studio .NET
Part III: Enhancing the Interface and User Experience
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You can use the ASPNET Panel control to generate <div> tags for layout Use class-based style rules the ones that start with a dot () and set the Panel control s CssClass property to the style s name
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Reducing Load Times and Improving Performance
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As Web pages become busier, performance starts to drag If a page seems slow on your workstation, expect it to get worse when posted to the Web server While you can t always control the speed of the Internet connection or the Web server s horsepower, you can certainly do your part to cut page load times and improve the overall throughput This section looks at two techniques: reducing ViewState and employing caching
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Turning off ViewState
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ASPNET server controls make programming easier, but they make Web pages fatter If you re not careful, ASPNET can bloat a relatively small page by overdoing a hidden feature called ViewState Look at the output of any ASPNET page and you find ViewState It resembles the following (much abbreviated) markup when you look at the HTML in the browser (View Source): <input type= hidden name= __VIEWSTATE id= __VIEWSTATE value= /wEPDwUL80sXAJunhsp3aKX6m/d /> ViewState is how ASPNET tracks the current settings for all its controls You see an ordinary, hidden <input> tag with a string of nonsense characters as the value attribute That value is the Web server s personal aide-memoire as to what the page was like when it sent the HTML to the browser That blob of overhead travels back and forth (it roundtrips in geekspeak) for no good reason If there s nothing in the server-side code that can change the text in a Label control or GridView, why track the ViewState You can turn off ViewState for an individual control (for instance, a TextBox) by setting its EnableViewState property to False If you re confident that none of the controls on a page will change, you can turn off ViewState for the entire page In Source view, at the top of the page, add the part that you see shown in bold: <%@ Page Language= VB EnableViewState= false %>
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12: Web Standards, Page Layout, and Usability
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Going to extremes, if you re positive that you don t need ViewState anywhere in the whole ASPNET site, you can switch it off in the webconfig file Look for the <page> element (somewhere within the <systemweb> element) and add the following part shown in bold: <pages enableViewState= false > Even when you turn off ViewState for an entire site, ASPNET doesn t give up completely Some remnants remain in the page as if it s using ViewState to track the fact that ViewState is off
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Caching expensive content
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When you identify a page that would benefit from caching, open the page in Source view and, at the top of the page, add the following directive: <%@ OutputCache Duration= 300 VaryByParam= none %> The preceding line of code gives these instructions to the Web server: Create this page as usual on the occasion that someone requests it Hold the page in memory for 300 seconds (five minutes) and send your cached copy if anyone else asks for it Yes, send the cached version even if the data in the database has changed After five minutes, dump the cached version and start over with a new page if asked
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