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To use automatic postback, you simply need to set the AutoPostBack property of a web control to true (the default is false, which ensures optimum performance if you don t need to react to a change event) When you do, ASPNET uses the client-side abilities of JavaScript to bridge the gap between client-side and server-side code Here s how it works: if you create a web page that includes one or more web controls that are configured to use AutoPostBack, ASPNET adds a JavaScript function to the rendered HTML page named __doPostBack() When called, it triggers a postback, posting the page back to the web server with all the form information ASPNET also adds two hidden input fields that the __doPostBack() function uses to pass information back to the server.

One of the most notable differences between the two is how much of the site is covered. Middleware is activated in a site s , so it covers all requests that come in on any URL. This simple fact provides a few advantages: request on the site; middleware makes these tasks easy to implement. having to make any special allowances for the behavior they provide. middleware behavior.

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This information consists of the ID of the control that raised the event and any additional information that might be relevant These fields are initially empty, as shown here: <input type="hidden" name="__EVENTTARGET" value="" /> <input type="hidden" name="__EVENTARGUMENT" value="" /> The __doPostBack() function has the responsibility for setting these values with the appropriate information about the event and then submitting the form A sample __doPostBack() function is shown here: <script language="javascript"> <!-function __doPostBack(eventTarget, eventArgument) { var theform = documentForm1; theform__EVENTTARGETvalue = eventTarget; theform__EVENTARGUMENTvalue = eventArgument; theformsubmit(); } // --> </script> Remember, ASPNET generates the __doPostBack() function automatically This code grows lengthier as you add more AutoPostBack controls to your page, because the event data must be set for each control Finally, any control that has its AutoPostBack property set to true is connected to the __doPostBack() function using the onClick or onChange attribute.

These attributes indicate what action the browser should take in response to the client-side JavaScript events onClick and onChange The following example shows the tag for a list control named lstCountry, which posts back automatically Whenever the user changes the selection in the list, the client-side onChange event fires The browser then calls the __doPostBack() function, which sends the page back to the server..

<select id="lstCountry" onchange="__doPostBack('lstBackColor','')" language="javascript"> In other words, ASP.NET automatically changes a client-side JavaScript event into a server-side ASP .NET event, using the __doPostBack() function as an intermediary. If you re a seasoned ASP developer, you may have manually created a solution like this for traditional ASP web pages. ASP .NET handles these details for you automatically, simplifying life a great deal.

Decorators, on the other hand, are applied to individual functions, which means that every view must have decorators added manually. This makes decorators a bit more time-consuming to manage, but some operations such as access restriction or specialized cache requirements are more appropriate for limited parts of the site, where decorators can be used to great effect.

Figure 20-1. The forms authentication process All you need to do is configure forms authentication in the web.config file, create the login page, and validate the credentials in the login page.

Cookie authentication is an attractive option for developers for a number of reasons: You have full control over the authentication code. You have full control over the appearance of the login form. It works with any browser. It allows you to decide how to store user information. Let s look at each of these in turn.

Because forms authentication is implemented entirely within ASP .NET, you have complete control over how authentication is performed. You don t need to rely on any external systems, as you do with Windows or Passport authentication. You can customize the behavior of forms authentication to suit your needs, as you will see in the section Persistent Cookies in Forms Authentication.

You have the same degree of control over the appearance of forms authentication as you do over its functionality. In other words, you can format the login form in any way you like. This flexibility in appearance is not available in the other authentication methods. Windows authentication needs the browser to collect credentials, and Passport authentication requires that users leave your website and visit the Passport site to enter their credentials.

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