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Programming User Interface for the Web
.NET provides web controls that resemble their common Windows counterparts, even maintaining their state automatically and raising server-side events. The programming models are so similar that user interface code can sometimes be transferred from one environment to the other. With new features like disconnected data access, you can even create a common back end of business objects that can be used in desktop and web applications.
There are still some restrictions inherent to the world of HTML. Most significant, HTML is not a windowing system. There's no practical way to create equivalents for secondary windows, message boxes, or floating tool windows. Because of these limitations, it's extremely difficult to create some application types that are easy for desktop applications, like document editors. There are also no rich menu controls. It's very likely that third-party component developers will start to create custom .NET menu controls that can render themselves as client-side DHTML, but for now you need to use button navigation panes or other controls.
The part of the .NET framework that allows you to create web applications is ASP.NET. ASP.NET elegantly solves some long-standing problems with Internet applications, but it also introduces a few wrinkles. For example, to react to an ASP.NET control event, you need to trigger a postback, which sends the page back to the server. This takes a short, but noticeable amount of time. It makes it impractical to update a display based on control changes, and impossible to use capture events like mouse movements or key presses. For reasons like this, you can't perform some types of automatic validations or restrictions. Instead, you need to validate all the controls after all the information is entered and the page is submitted. ASP.NET also introduces data binding as a key technique. It works quite a bit differently than data binding in a desktop application, however, and requires special considerations. Finally, you should also be aware that there is little standardization in the Internet world. Most users can agree about attractive and ugly sites, but the web developer who adopts the visual style of another web site is accused of copying, not praised for following convention.
