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Back to Basics (10/2/2001) ASP.NET Peter McMahon Visual Studio.NET's support for quickly and easily building ASP.NET "Web Forms" applications is great in many respects. ASP developers can now gain a huge productivity boost from using VS.NET and ASP.NET, and it makes the transition from traditional Windows application programming in VB, or any other language for that matter, to web application development significantly easier. If fact, VS.NET makes building Web Applications so similar to the process of building Windows applications that traditional developers should be up-and-running with their first web form in under 5 minutes. However, this extreme ease-of-use and severe straightening of the web application learning curve is probably going to have some undesirable effects on the development landscape. Pre VS.NET, building web applications required some fundamental knowledge of how the Internet works and how web browsers work. The developer had to know HTML, and knowledge of CSS and client-side scripting was also a requirement for anyone who was even remotely serious about the whole matter. After learning these basics, the aspiring web developer could then proceed to learn ASP, PHP, JSP or whatever other server-side architecture seemed appealing. In learning this, they'd be forced to learn at least a little about how HTTP works (what's contained in the HTTP header, how cookies and form data is transported, the difference between POST and GET etc), how to administer web server software (be it Apache or IIS) and other items that are almost second-nature to seasoned web developers. Enter ASP.NET and VS.NET. You sit a few controls on the form, add the event handler code, and away you go. Everything just works. However, in creating the simplest of "Hello World" ASP.NET examples in VS.NET, the IDE will have performed a myriad of operations. It will have created a virtual directory for the application in IIS, set up a site-wide stylesheet, created client-side 'postback' code, maintained state using hidden form fields and other trickery. Of course, anyone who's worked with ASP for a reasonable amount of time will be able to understand most of what ASP.NET and VS.NET are doing 'behind-the-scenes' after a quick run-through of the ASP.NET code, and the HTML and client-side code that it generates. If something goes wrong, or ASP.NET refuses to do something, having a quick dig in the HTML code that it's generating will probably reveal what you're doing wrong and avoid hours of frustration. However, someone who doesn't have any experience with HTML and HTTP, beyond using the Internet, is going to battle when things go wrong. A classic example of this is evident in the amount of times the question "Why doesn't 'MsgBox' work in ASP.NET?" is posted to the ASP.NET newsgroups. Anyone familiar with how web servers work will know the answer, but to anyone who doesn't, the answer isn't going to be immediately clear, and even once the answer has been given, they're more than likely still going to be confused unless they're given an elaborate explanation of how web servers work. The concept is simple, but without some exposure to a web server, understanding is going to be difficult. If you want it to, VS.NET can totally shield you from IIS. You can develop an entire web application without ever even opening the IIS management console. For the seasoned ASP developer, this is a bonus - no longer do you need to manually create folders and virtual directories, but for new web developers, they're probably only going to discover what the purpose of IIS even is once they're trying to deploy their application. The first question I can see coming from newbies is, "Where are all the files? I go to the 'Visual Studio Projects' folder in 'My Documents', and the solution file (.sln) for the project is there, but everything else is gone?" Developers who have worked with IIS before will know to look in their IIS default website's home directory, but how is a developer who's never worked with IIS before supposed to smell this? This is the first in a long line of problems. What happens when they do actually deploy the application? Assuming they know how to use FTP, how must they know to ask their ISP to create a Virtual Directory in IIS for their application? Even if they read somewhere that a Virtual Directory must be set up, are they going to know why? If not, this has some reprecussions on understanding application scope. The list of problems that are going to face first-time web developers (even if they're seasoned traditional VB developers) is definitely going to be long if they don't first take the time to get up to speed on HTML, CSS, client-side scripting, HTTP and web server software. If they do, VS.NET will be a wonderfully productive tool for them, as it will for current ASP developers, but if they don't, the perils of web development will rear their ugly heads even more than the perils of Win32 programming raised theirs when Visual Basic first attempted to hide the horrors of Windows programming from the developer. I am not attempting to discourage new web developers, or imply that Microsoft has done a shoddy job in building VS and ASP.NET - to the contrary, they've done a superb job on both counts, and I personally love both of them, but I do feel that those developers wanting to broaden their horizons by learning web development with VS.NET should first take the time out to learn the basics, as it'll pay off in the long run. 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