how to generate barcode in c# Part IV in .NET

Assign qr bidimensional barcode in .NET Part IV

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data that should be passed to the callback method when the thread pool thread calls it; pass null if you have no special state data to pass . The fourth parameter, millisecondsTimeoutInterval, allows you to tell the thread pool how long it should wait for the kernel object to become signaled . It is common to pass Timeout.Infinite (-1) here to indicate an infinite timeout . If the last parameter, executeOnlyOnce, is true, a thread pool thread will execute the callback method just once . But if executeOnlyOnce is false, a thread pool thread will execute the callback method every time the kernel object becomes signaled . This is most useful when waiting for an AutoResetEvent object . When the callback method is called, it is passed state data and a Boolean value, timedOut . If timedOut is false, the method knows that it is being called because the kernel object became signaled . If timedOut is true, the method knows that it is being called because the kernel object did not become signaled in the time specified . The callback method can perform whatever action it desires based on the value that it receives in the timedOut argument . You ll notice that the RegisterWaitForSingleObject method returns a reference to a RegisteredWaitHandle object . This object identifies the kernel object that the thread pool is waiting on . If, for some reason, your application wants to tell the thread pool to stop watching the registered wait handle, your application can call RegisteredWaitHandle s Unregister method:
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// Execute the query and return the results return DatabaseHandler::GetAll($result, $params); } // Assigns a product to a category public static function SetProductDisplayOption($productId, $display) { // Build the SQL query $sql = 'SELECT catalog_set_product_display_option( :product_id, :display);'; // Build the parameters array $params = array (':product_id' => $productId, ':display' => $display); // Prepare the statement with PDO-specific functionality $result = DatabaseHandler::Prepare($sql); // Execute the query return DatabaseHandler::Execute($result, $params); } // Assigns a product to a category public static function AssignProductToCategory($productId, $categoryId) { // Build the SQL query $sql = 'SELECT catalog_assign_product_to_category( :product_id, :category_id);'; // Build the parameters array $params = array (':product_id' => $productId, ':category_id' => $categoryId); // Prepare the statement with PDO-specific functionality $result = DatabaseHandler::Prepare($sql); // Execute the query return DatabaseHandler::Execute($result, $params); } // Moves a product from one category to another public static function MoveProductToCategory($productId, $sourceCategoryId, $targetCategoryId) { // Build the SQL query $sql = 'SELECT catalog_move_product_to_category(:product_id, :source_category_id, :target_category_id);'; // Build the parameters array
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Sample of Visual Basic Code Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) _ Handles Me.Load If Not IsPostBack Then TextBoxFirst.Text = Profile.FirstName TextBoxLast.Text = Profile.LastName LabelLastVisit.Text = Profile.LastVisit.ToString() End If End Sub Sample of C# Code protected void Page_Load(object sender, EventArgs e) { if (!IsPostBack) { TextBoxFirst.Text = Profile.FirstName; TextBoxLast.Text = Profile.LastName; LabelLastVisit.Text = Profile.LastVisit.ToString(); } }
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Troubleshooting Lab
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The behavior of each page can be declaratively controlled through the attributes of the @Page directive. To get the most out of the Page class, though, you must become familiar with properties, methods, and events of the Page class and have a clear idea of the page life cycle in the ASP.NET runtime. Overall, the structure of the page has not been revolutionized in the transition from ASP.NET 1.x to ASP.NET 2.0. However, quite a few new features have been added. Some are related to the page as an object; some are inherited from the surrounding runtime environment.
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B. Correct: A user control s associated code should inherit from the UserControl class. c. Incorrect: A user control should inherit from the UserControl class. A webpage inherits
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1. From the console tree of the Internet Authentication Service snap-in, rightclick Remote Access Policies and then click New Remote Access Policy. 2. On the Welcome To The New Remote Access Policy Wizard page, click Next. 3. On the Policy Configuration Method page, type the name of the policy in Policy Name. 4. Click Next. 5. On the Access Method page, select VPN. 6. Click Next. 7. On the User Or Group Access page, select Group. 8. Click Add. 9. In the Select Groups dialog box, type the name of your universal or global VPN calling routers group in the Enter The Object Names To Select text box. 10. Click OK. Your VPN calling routers group is added to the list of groups on the User Or Group Access page.
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Remote Connectivity and Security Considerations
Equivalent Expression not ( A or B ) not ( A or not B ) not ( not A or B ) not ( not A or not B ) not ( A and B ) not ( A and not B ) not ( not A and B ) not ( not A and not B )
COM, you can write your add-ins using Visual Basic .NET or C#. Although I like C++ as much as the next developer, I like the productivity enhancement of .NET even more, so in this chapter I'll concentrate on those issues related to writing add-ins in managed languages. As usual, you should start your add-in journey by reading the documentation. Second, you need to visit samples/automation.asp, which is the page that contains all the add-in and wizard samples Microsoft has released. You'll definitely want to spend a good deal of time reading the code for those samples as that's the best way to learn. Many of the add-ins are written in multiple languages, so you shouldn't have any trouble with them. Some of the more advanced samples, such as RegExplore, are available only in C++. I have to point out that the C++ code in Microsoft's samples is a perfect example of poor coding. Much of the code is rife with magic macros that do error handling through gotos and that rely on assumed names. Sadly, the same bad code is generated from the Add-In wizard. If you do choose to use C++ for writing add-ins, please don't follow Microsoft's example! One item you'll want to make sure to check out is Unsupported Tools. You can either download it or find the current version in the UnsupportedAddInTools directory in this book's sample code. The tools contain a program named Generate ICO Data for Extensibility (GenerateIcoData.exe) that's necessary to get the hex stream for an icon so that you can put a custom icon in the About box. I'll show you how to do this in the next section. An additional tool contained in Unsupported Tools is a nice add-in named the Extensibility Browser (ExtBrws.dll), which will show you all the late-bound properties for the DTE (Development Tools Environment) object, which is the root of everything in the Visual Studio .NET extensibility model. Since some of these properties are not very well documented, having ExtBrws.dll to show them to you is helpful. If you're a COM programmer from way back, you can also use OLE/COM Object Viewer to browse these properties as well. Fixing the Add-In Wizard Generated Code When you first create a C# or Visual Basic .NET add-in using the Visual Studio .NET Add-In Wizard, which you can find in the Other Projects\Extensibility Projects directory of the New Project dialog box, the code can stand some fixing up. In this section, I want to discuss what you want to do immediately after generating a skeleton add-in so that you can streamline your development and not drive yourself crazy with problems from the stock code. Along the way, I'll point out some key facts about how add-ins work so that you'll have an idea about why I make certain suggestions. The very first task you need to do after clicking the Finish button in the Add-In wizard is open the Registry Editor. The Add-In wizard creates some registry entries you need to export to a .REG file. The registry key starts at either HKEY_LOCAL_MACHINE or HKEY_CURRENT_USER depending on whether you wanted the add-in available to all users. The rest of the key is the same: \Software\Microsoft\VisualStudio\7.1\AddIns\<Add In Name>. You'll want to save all the keys and values that are under your add-in name, which for the rest of this discussion I'll call the add-in key. If you look at the key created by the Add-In wizard, you'll notice that some of the value names make perfect sense, such as AboutBoxDetails, AboutBoxIcon, FriendlyName, and Description. A couple of other keys need more explanation because they're extremely important to debugging and developing your add-in. The first is 380
Finalization is a mechanism offered by the CLR that allows an object to perform some graceful cleanup prior to the garbage collector reclaiming the object s memory . Any type that wraps a native resource, such as a file, network connection, socket, mutex, or other type, must support finalization . Basically, the type implements a method named Finalize . When the garbage collector determines that an object is garbage, it calls the object s Finalize method (if it exists) . I think of it this way: Any type that implements the Finalize method is in effect stating that all of its objects want a last meal before they are killed . Microsoft s C# team felt that Finalize methods were a special kind of method requiring special syntax in the programming language (similar to how C# requires special syntax to define a constructor) . So, in C#, you must define a Finalize method by placing a tilde symbol (~) in front of the class name, as shown in the following code sample:
FileStream(string path, FileMode mode, FileAccesss access);
In addition to setting properties for individual printers by using their properties dialog boxes, you can set other properties by visiting the Print Server Properties dialog box. To get there, right-click a blank area of the Printers folder and then choose Run As Administrator, Server Properties. The first three tabs control the list of items you see in the properties dialog box for a printer:
The Windows Server 2003 Routing And Remote Access service has an extensive tracing capability you can use to troubleshoot complex network problems. You can enable the components in Windows Server 2003 to log tracing information to files by using the netsh command or through the registry.
16: Building the Future
Blogs (or weblogs ) are frequently updated journal-style web pages where content is displayed in reverse time order (the most recently posted content is at the top of the front page). Blogs have become important places to go for the latest Ruby news, and the thoughts and latest projects of developers in the Ruby community.
Note that the rule ties the filter list and the filter action and selects the authentica tion method. If no authentication method is specified, Kerberos is used by default. 6. Prepare the filter list and filter action for the second rule. Create a filter list with one filter that triggers on telnet and blocks telnet from all computers:
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