asp net core barcode scanner

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I ve mentioned view state a couple of times in this chapter, but what is it And what does it do for you Typically, web applications are stateless. Normally when we think of a stateless web application, we re thinking of an application that doesn t correlate invocations of the various pages in the application. Conversely, if you visit an online store and place an item in your shopping cart, you expect that item to be available in your shopping cart for checkout. This is known as session state. But there is another type of stateless behavior going on here the server will lose the page s control information between postbacks unless we do something about it. From HTML s inception, servers (for performance reasons) throw control values away when pages are posted back. To do otherwise typically consumes resources on the server and dramatically affects the scalability of the application. And as we saw earlier, even in the simplest of applications adding two numbers statelessness drastically affects the usability of the application because of this. A number of methods, such as cookies, could be used to maintain state on a page, but they can lead to security problems and privacy issues. Additionally, cookie use often requires a lot of development overhead, particularly for sophisticated applications. .NET has introduced the concept of view state to overcome these problems while ASP .NET page, you also minimizing the impact on the developer. When you define an ASP

To configure the Image Assist module, you need to set permissions and input formats. Then you can configure access, image output, and preview settings.

Physical layer: Defines the type of medium, the transmission method, and the rates available for the network. Some networks have broadband communication, measured in megabits per second, whereas others have narrower communication in the kilobit range or less. Because of the wide variance in bandwidth, different behavior can be expected, and applications that implement network protocols have to be aware of this. Thus, the physical layer has to be able to provide this data to the next layer up, and respond to command instructions from it. You can see this seven-layer model, and how typical TCP/IP applications such as the web browser fit into it, in Figure 1-1.

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Image Assist can achieve the task of inserting images into posts in two ways: Insert special non-HTML tags called macros into the post These macros are then replaced with HTML at page-load time by the content filter system Insert finished HTML into the post, without any further filtering The macro tag approach has the advantage that you can change the template for inserted images on a live site, and the change will take place for all previously inserted images This is helpful if you might be updating the look of your site sometime in the future It also has the advantage that you can force your users into using Image Assist and only Image Assist, as opposed to typing the HTML for images directly into their posts You could do this by using the input filters to disallow <img> tags in the posts.

On the other hand, using macro tags requires that you take the extra step of adding the Image Assist filter to your input format Another disadvantage is that you cannot edit the HTML that is generated from within your post, so you cannot customize the appearance of your images on a per-node basis Also, at page-load time, you might see a slight performance reduction compared with the pure HTML method, since Image Assist must run the regular expressions to find and replace the macro tags.

This model provided the foundation for what would become the Internet, and the Internet provided the foundation for what would become the World Wide Web. By using TCP/IP, it became possible to build first a file transfer protocol (FTP) and ensuing application. From there, Tim Berners-Lee expanded the idea to having a live view of the file in an application called a browser. Instead of just transferring a document from a distant machine to your own, the application would also render the file. To do this, the file would need to be marked up in a special way that could be understood by the browser. A natural progression to this is to allow documents to be linked to each other, so that when the user selects a link, they are taken to the document that the link refers to. This introduced the concept of hypertext, and thus HTML (Hypertext Markup Language) was invented.

Here is a list of questions to answer when making the decision of whether to go with Image Assist macro tags or pure HTML: Do you need to restrict users from using the <img> tag directly Do you need the HTML template for in-line images to remain consistent across your site over time, even if you decide to change it Do you sometimes wish to change or customize the HTML for your in-line images for a particular post If you answered yes to either of the first two questions, the Image Assist macro tags are right for you If you answered yes to third question, you probably want to use pure HTML The macro tags are used by default There is no setting that makes pure HTML the default and only choice.

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