asp.net pdf 417 reader

asp.net pdf 417 reader

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One useful feature of this section is the Viewstate column, which tells you how many bytes of space are required to persist the current information in the control This can help you gauge whether enabling control state could affect page transmission times These sections display every item that is in the current session or application state Each item is listed with its name, type, and value If you re storing simple pieces of string information, the value is straightforward If you re storing an object, NET calls the object s ToString() method to get an appropriate string representation For complex objects, the result may just be the class name This section displays all the cookies that are sent with the response, as well as the content and size of each cookie in bytes Even if you haven t explicitly created a cookie, you ll see the ASP .

Here s an example of an <iframe> tag: <iframe src="page.aspx" width="40%" height="80" align="right"> </iframe> The key problem with the <iframe> tag is that support is not universal across all browsers. Internet Explorer has supported it since version 3, but Netscape added it only in version 6. However, you can define static text that will be displayed in browsers that don t recognize the tag, as shown here: <iframe src="page.aspx" width="40%" height="80" align="right"> <p>See the content at <a href="page.aspx">page.aspx</a>.</p> </iframe> Once you ve added an <iframe> to your page, you can define it in the code-behind to access it programmatically. ASP.NET doesn t have a control class that specifically represents the <iframe>, so you need to use the HtmlGenericControl. (In Visual Studio .NET, just right-click the control, and choose Run As Server Control). Now you can set the src attribute at any point to redirect the frame: IFrame1.Attributes["src"] = "page.aspx"; Of course, you can t actually interact with the page objects of the embedded page. In fact, the page isn t even generated in the same pass. Instead, the browser will request the page referenced by the src attribute separately and then display it in the frame. However, you can use a variety of techniques for passing information between the pages, including session state and the query string. Figure 29-18 shows a page with two embedded frames, one of which has a border. The topmost <iframe> is using the page processor from earlier in this chapter, which indicates to the user that a part of the page is still being processed.

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Customizing the page via dragging and dropping uses special DHTML features of Internet Explorer and therefore works only for Internet Explorer. All the other features such as adding personalization, minimizing and maximizing windows, and adding web parts from the catalog to specific zones work with any browser of your choice.

NET_SessionId cookie, which contains the current session ID If you re using forms-based authentication, you ll also see the security cookie This section lists all the HTTP headers associated with the request This section lists the posted-back form information This section lists the variables and values submitted in the query string This section lists all the server variables and their contents..

All the changes you make will be stored persistently in the personalization store based on the personalization provider. Later in the Final Tasks for Personalization section, you will learn how you can enable and disable personalization at a per-page level. Furthermore, if you are developing a

Summary

Tracing complements Visual Studio debugging. In many cases, debugging is the best approach for solving problems while you are coding a web application, while tracing gives you an easier option if you need to troubleshoot problems that appear while the application is running on a web server. However, tracing provides a few services that debugging doesn t (at least not as easily), such as showing you the amount of information in view state and the time taken to process the page on the server. Tracing also works regardless of whether you build your application in debug mode (with the debug symbols) or release mode.

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