generate qr code programmatically c# Page Composition and Usability in C#

Generation QR Code ISO/IEC18004 in C# Page Composition and Usability

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Page Composition and Usability
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content exposed by pages. HTML pages can include a couple of interesting meta tags in their <head> section. These meta tags are keywords and description:
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<head> <meta name="keywords" content="ASP.NET Web Forms, Book, Training" /> <meta name="description" content="This book explains how ASP.NET works so that you find out yourself how to do things." /> ... </head>
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In ASP.NET 4, you can set the keywords and description attributes easily through a pair of new properties added to the Page class. (See 5.) Today, however, the importance of the keywords meta tag is diminished. Bing and Google, for example, have both stated explicitly that they don t use keywords declared in the <head> of the page but actually extract real keywords from the content. In light of this, using the keywords meta tag to list your page keywords is hardly a bad thing, but it is not a decisive factor in determining the final ranking. A common use of the keywords meta tag today is also to associate your page with misspelled keywords. For example, if your page is about tennis, the engine will easily figure that out from the content and rank it accordingly. However, if you list words like tenis in the keywords, you have a better chance of your page being picked up when the user mistypes words. The description meta tag, instead, is more relevant, even though it s not specifically for raising the rank. If a description meta tag is found, search engines embed that content in the result page instead of creating their own description. If the description is attractive enough, your page has more chances to be clicked. A description is ideally around 200 characters and should read well and be informative. Search engines don t like many things that often populate Web pages. They don t like duplicated URLs, for example. If there are two or more URLs used to get the same content, search engines tend to lower the page ranking. This happens even if you have subdomains, such as www.yourserver.com and yourserver.com. Without a permanent redirect being configured at the Internet Information Services (IIS) level, your home page will suffer. Search engines don t like query strings, hidden fields, Flash/Silverlight components, or rich JavaScript content. All these things make the page harder to analyze. Search engines, instead, love plain anchor tags, title attributes, and alt attributes plain HTML. If not properly handled, redirects are also problematic because they can lead to duplicated URLs. Classic redirects you perform through Response.Redirect result in an HTTP 302 status code. As developers, we tend to forget that HTTP 302 indicates a temporary redirect. A temporary redirect therefore tells engines that eventually the page being moved will return to its original location. If this doesn t happen, engines keep on storing two locations for the same content. A permanent redirect is HTTP 301, which in ASP.NET 4 is enforced by a new method Response.PermanentRedirect. Query strings should be avoided too. Ideally, URLs should be extensionless and represent a meaningful path within the content of the page. URL rewriting is an ASP.NET technique that
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Part II
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ASP.NET Pages and Server Controls
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can help in this regard. In ASP.NET 4, however, routing is a type of URL rewriting that offers a richer programming model and the same (if not higher) degree of effectiveness. (See 4, HTTP Handlers, Modules, and Routing. )
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SEO and ASP.NET
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Although ASP.NET 4 put some effort into making it easier for you to improve SEO, there are a few structural aspects of ASP.NET that are not specifically optimized for search engines. I don t mean this to be necessarily a bad statement about ASP.NET Web Forms as a platform. On the other hand, ASP.NET Web Forms was designed a decade ago when we all were living in a totally different world and were chasing different priorities than today. In this regard, ASP.NET MVC is a better (because it s newer) platform that is natively optimized for search engines. So my point here is don t be fooled if you read that ASP.NET improves SEO. It simply gives you some new tools for implementing features (permanent redirection, meta description, routing) that were only harder, but not impossible, to achieve before. Let s briefly review some structural SEO-related issues of ASP.NET. The postback mechanism carried via JavaScript code is like smoke in the eyes of search engines. Every time you use link buttons or built-in paging/sorting capabilities of databound controls, you put your page at risk of not being ranked properly. Search engines don t follow JavaScript and ignore cookies. Because the session ID is stored in a cookie and engines ignore cookies, some of the page content might remain undiscovered. What about a cookieless approach for sessions, then (We ll discover this feature in 17, ASP.NET State Management. ) It would be even worse because it would produce a lot of duplicated URLs, confusing engines even more. Finally, the ASP.NET view state. The view state is a potentially large hidden field usually stored at the beginning of the page, right after the opening <form> tag. For a while, it was assumed that to make the process quicker, search engines could read only the first chunk of the page (maybe 100 KB). In this way, because the view state is at the top and much of the real content would be out of reach. This is conjecture, however, as there s currently no evidence that search engines do this. In the end, moving the view state to the bottom of the page to get some alleged SEO benefits can actually be dangerous because the user, in cases where there s a very large view state, will likely get the opportunity to post back before the entire content is loaded. This situation, as you can guess, could cause errors. For completeness, you can move the view state to the bottom of the page using a little-known attribute in the configuration:
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