rdlc data matrix

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If you want to change the value of an existing application-level data item, you need only make a new assignment to the data item in question. Assume your page now has a Button that allows your user to change the current hotshot salesperson by reading in a value from a TextBox named txtNewSP. The Click event handler is as you d expect: protected void btnSetNewSP_Click(object sender, EventArgs e) { // Set the new Salesperson. ((CarLotInfo)Application["CarSiteInfo"]).salesPersonOfTheMonth = txtNewSP.Text; } If you run the web application, you ll find that the application-level data item has been updated. Furthermore, given that application variables are accessible by any user on any page in the Web application, if you launched three or four instances of your web browser, you d find that if one instance changes the current hotshot salesperson, each of the other browsers displays the new value on postback. Figure 34-5 shows some possible output.

With the path prefix set to fr, Drupal will determine the current language by looking at the requested URL. The process is shown in Figure 19-22.

Understand that if you have a situation where a set of application-level variables must be updated as a unit, you risk the possibility of data corruption (since it is technically possible that an applicationlevel data point may be changed while another user is attempting to access it!). You could take the long road and manually lock down the logic using threading primitives of the System.Threading namespace, but the HttpApplicationState type has two methods, Lock() and Unlock(), that automatically ensure thread safety: // Safely access related application data. Application.Lock(); Application["SalesPersonOfTheMonth"] = "Maxine";

Application["CurrentBonusedEmployee"] = Application["SalesPersonOfTheMonth"]; Application.UnLock();

When language negotiation is set to this setting, Drupal will first look at the path prefix. If a match is not made, the user s preferred language is checked by examining $user->language. If the user has not selected a preferred language, Drupal next tries to determine the user s preferred language by looking at the Accept-language HTTP header in the browser s HTTP request. If the browser does not specify a preferred language, the default language for the site is used. Assuming that English is the default language for the site, and both French and Hebrew are enabled, the process of language determination is shown in Figure 19-23.

The HttpApplicationState type is designed to maintain the values of the items it contains until one of two situations occurs: the last user on your site times out (or manually logs out) or someone manually shuts down the web site via IIS. In either case, the Application_End() method of the HttpApplicationderived type will automatically be called. Within this event handler, you are able to perform whatever sort of cleanup is necessary: void Application_End(Object sender, EventArgs e) { // Write current application variables // to a database or whatever else you need to do... }

ASP.NET provides a second and more flexible way to handle application-wide data. As you recall, the values within the HttpApplicationState object remain in memory as long as your web application is alive and kicking. Sometimes, however, you may want to maintain a piece of application data only for a specific period of time. For example, you may wish to obtain an ADO.NET DataSet that is valid for only five minutes. After that time, you may want to obtain a fresh DataSet to account for possible database updates. While it s technically possible to build this infrastructure using HttpApplicationState and some sort of handcrafted monitor, the ASP.NET application cache greatly simplifies your task. As its name suggests, the ASP.NET System.Web.Caching.Cache object (which is accessible via the Context.Cache property) allows you to define objects that are accessible by all users from all pages for a fixed amount of time. In its simplest form, interacting with the cache looks identical to interacting with the HttpApplicationState type: // Add an item to the cache. // This item will *not* expire. Context.Cache["SomeStringItem"] = "This is the string item"; // Get item from the cache. string s = (string)Context.Cache["SomeStringItem"];

When language negotiation is set to this setting, Drupal will determine the current language by attempting to match the current URL with the language domain specified in the Language domain field of the Edit language page of a language (see Figure 19-21). For example, with English as the default language, specifying http://fr.example.com as the language domain for the French language would set the current language to French for users visiting http://fr.example.com/ q=node/2 and English for users visiting http://example.com/ q=node/2.