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Another very important member of HttpRequest is the IsPostBack property. Recall that postback refers to a web page posting back to the same URL at the Web server. Given this definition, understand that the IsPostBack property will return true if the current HTTP request has been sent by a user currently in session, and false if this is the user s first interaction with the page. Typically, the need to determine whether the current HTTP request is indeed a postback is most helpful when you wish to execute a block of code only the first time the user accesses a given page. For example, you may wish to populate an ADO.NET DataSet when the user first accesses an *.aspx file and cache the object for later use. When the caller returns to the page, you can avoid the need to hit the database unnecessarily (of course, some pages may require that the DataSet always be updated upon each request, but that is another issue). Assuming your *.aspx file has handled the page s Load event (described in detail later in this chapter), you could programmatically test for postback conditions as follows: protected void Page_Load(object sender, System.EventArgs e) { // Fill DataSet only the very first time // the user comes to this page. if (!IsPostBack) { // Populate DataSet and cache it! } // Use cached DataSet. } asp.net upc-a UPC-A . NET Control - UPC-A barcode generator with free . NET ...
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6 Apr 2005 ... Demonstrates a method to draw UPC-A barcodes using C#. ... NET 2003 - 7.87 Kb. Image 1 for Drawing UPC-A Barcodes with C# ... Figure 18-7. The voting widget We ll have to get some basic module building out of the way before we can get to the actual jQuery part of plusone. Please see 2 if you ve never built a module before. Otherwise, let s get to it! Create a directory in sites/all/modules/custom, and name it plusone (you might need to create the sites/all/modules/custom directory). Inside the plusone directory, create the file plusone.info, which contains the following lines: name = Plus One description = "A +1 voting widget for nodes. " package = Pro Drupal Development core = 7.x files[]=plusone.module This file registers the module with Drupal so it can be enabled or disabled within the administrative interface. asp.net upc-a Barcode UPC-A - CodeProject
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NET UPC-A Generator Controls to generate GS1 UPC-A barcodes in VB. NET , C# applications. Download Free Trial Package | Developer Guide included ... Now that you have a better understanding of how the Page type allows you to interact with the incoming HTTP request, the next step is to see how to interact with the outgoing HTTP response. In ASP.NET, the Response property of the Page class provides access to an instance of the HttpResponse type. This type defines a number of properties that allow you to format the HTTP response sent back to the client browser. Table 32-6 lists some core properties. Table 32-6. Properties of the HttpResponse Type Cache ContentEncoding ContentType Cookies Output OutputStream StatusCode StatusDescription SuppressContent asp.net upc-a UPC-A Barcode Generator for ASP . NET Web Application
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The UPC-A Code and the assignment of manufacturer ID numbers is controlled in the ... ASP . NET /Windows Forms/Reporting Services/Compact Framework ... Next, you ll create the plusone.install file. The functions within this PHP file are invoked when the module is enabled, disabled, installed, or uninstalled, usually to create or delete tables from the database. In this case, we ll want to keep track of who voted on which node: < php /** * Implements hook_install(). */ function plusone_install() { // Create tables. drupal_install_schema('plusone'); } /** * Implements hook_schema(). */ function plusone_schema() { $schema['plusone_votes'] = array( 'description' => t('Stores votes from the plusone module.'), 'fields' => array( 'uid' => array( 'type' => 'int', 'not null' => TRUE, 'default' => 0, 'description' => t('The {user}.uid of the user casting the vote.'), ), 'nid' => array( 'type' => 'int', 'unsigned' => TRUE, 'not null' => TRUE, 'default' => 0, 'description' => t('The {node}.nid of the node being voted on.'), ), 'vote_count' => array( 'type' => 'int', 'not null' => TRUE, 'default' => 0, 'description' => t('The number of votes cast.'), ), ), 'primary key' => array('uid', 'nid'), 'indexes' => array( 'nid' => array('nid'), 'uid' => array('uid'), ), ); return $schema; } Also, add the file sites/all/modules/custom/plusone/plusone.css. This file isn t strictly needed, but it makes the voting widget a little prettier for viewing, as shown in Figure 18-8. Returns the caching semantics of the web page (see 34) Gets or sets the HTTP character set of the output stream Gets or sets the HTTP MIME type of the output stream Gets the HttpCookie collection that will be returned to the browser Enables text output to the outgoing HTTP content body Enables binary output to the outgoing HTTP content body Gets or sets the HTTP status code of output returned to the client Gets or sets the HTTP status string of output returned to the client Gets or sets a value indicating that HTTP content will not be sent to the client
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