Introduction to Microsoft Intermediate Language in visual C#

Incoporate barcode data matrix in visual C# Introduction to Microsoft Intermediate Language

ChAPTER 2
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On my system, this query ran for 10 seconds against a cold cache and 1 second against a warm cache . Clear the cache again, and then run the cursor code twice:
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The problems with pure top-down and pure bottom-up integration have led some experts to recommend a sandwich approach (Myers 1976). You first integrate the high-level business-object classes at the top of the hierarchy. Then you integrate the device-interface classes and widely used utility classes at the bottom. These high-level and low-level classes are the bread of the sandwich. You leave the middle-level classes until later. These make up the meat, cheese, and tomatoes of the sandwich. If you re a vegetarian, they might make up the tofu and bean sprouts of the sandwich, but the author of sandwich integration is silent on this point maybe his mouth was full. Here s an illustration of the sandwich approach:
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<input id="UserEmail" type="text" runat=server size=30 /> </td> <td> <ASP:RequiredFieldValidator ControlToValidate="UserEmail" Display="Static" ErrorMessage="*" runat=server /> </td> </tr> <tr> <td> Password: </td> <td> <input id="UserPass" type=password runat=server size=30 /> </td> <td> <ASP:RequiredFieldValidator ControlToValidate="UserPass" Display="Static" ErrorMessage="*" runat=server /> </td> </tr> <tr> <td colspan=3 align="center">
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There s only a little information in this section that hasn t already been covered in 4 . Open the Format tab of the Drawing Tools in the Ribbon by double-clicking the drawing object and you subsequently have access to combined format specifications, Shape Fill commands, and Shape Outline commands in the Shape Styles group (see Figure 5-13, A and B) .
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After a resource is set, Visual Studio displays the default resource value for the control in design view. Of course, this will be changed to display the language-specific resource when a user visits the webpage. Within the page markup, Visual Studio updates the control s Text property to explicitly bind to the resource. For example, if you are binding a Label control s Text property to a resource named WelcomeString in the SharedLocalizedText resource file(s), the markup looks as follows.
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A P P E NDI X A R U B Y P R I M E R A N D R E V I E W F O R D E V E LO P E R S
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These are the main reasons why many developers avoid the APM . However, I have created a class, AsyncEnumerator, which simplifies all of this and fixes all the problems mentioned above . In a nutshell, my AsyncEnumerator class allows you to perform asynchronous operations using a synchronous programming model by leveraging C# s iterator language feature . The class is part of my Power Threading library and is completely free to use . Versions of this library exist for the desktop CLR, Silverlight, and the Microsoft .NET Compact Framework . You can download the latest version of the library and sample code from http://Wintellect.com/PowerThreading.aspx. This Web page contains links to my Concurrent Affairs column in MSDN Magazine, where I explain how my AsyncEnumerator class works . There are also links to some videos I did showing how to use it, and a link to a newsgroup where I offer free technical support . For now, let me just share some of the features that the AsyncEnumerator class offers:
// Get the address in memory of the Byte[] fixed (Byte* pbytes = bytes) { originalMemoryAddress = (IntPtr) pbytes; } // Force a collection; the garbage objects will go away & the Byte[] might be compacted GC.Collect(); // Get the address in memory of the Byte[] now & compare it to the first address fixed (Byte* pbytes = bytes) { Console.WriteLine("The Byte[] did{0} move during the GC", (originalMemoryAddress == (IntPtr) pbytes) " not" : null); } }
As before, any objects that were in generation 0 that survived the garbage collection are now in generation 1; any objects that were in generation 1 that survived the collection are now in generation 2 . As always, generation 0 is empty immediately after a garbage collection and is where new objects will be allocated . Objects in generation 2 are objects that the garbage collector has examined two or more times . There might have been several collections, but the objects in generation 1 are examined only when generation 1 reaches its budget, which usually requires several garbage collections of generation 0 . The managed heap supports only three generations: generation 0, generation 1, and generation 2; there is no generation 3 .3 When the CLR initializes, it selects budgets for all three generations . As I mentioned earlier, the budget for generation 0 is about 256 KB, and the budget for generation 1 is about 2 MB . The budget for generation 2 is around 10 MB . Again, the budget sizes are selected to improve performance . The larger the budget, the less frequently a garbage collection will occur . And again, the performance improvement comes because of the initial assumptions: new objects have short lifetimes, and older objects are likely to live longer . The CLR s garbage collector is a self-tuning collector . This means that the garbage collector learns about your application s behavior whenever it performs a garbage collection . For example, if your application constructs a lot of objects and uses them for a very short period of time, it s possible that garbage collecting generation 0 will reclaim a lot of memory . In fact, it s possible that the memory for all objects in generation 0 can be reclaimed . If the garbage collector sees that there are very few surviving objects after collecting generation 0, it might decide to reduce the budget of generation 0 from 256 KB to 128 KB . This reduction in the allotted space will mean that garbage collections occur more frequently but will require less work for the garbage collector, so your process s working set will be small . In fact, if all objects in generation 0 are garbage, a garbage collection doesn t have to compact any memory; it can simply set NextObjPtr back to the beginning of generation 0, and then the garbage collection is performed . Wow, this is a fast way to reclaim memory! Note The garbage collector works extremely well for applications with threads that sit idle at
In this example, assume that the user drags the mouse pointer when he or she holds down the mouse button, so the mouseDown Boolean can be set to true. You also want to know the position of the mouse, which you can store in a Point, and the view port position of the mouse, which you can also store in a Point. Finally, you want the MultiScaleImage to trap all mouse commands, and you can do this by using the CaptureMouse method. When the mouse button is held down, typically users start dragging, and when they do so you want them to be able to pan around the image. Here s the code to achieve this:
Figure 4-8. Row Numbers benchmark graph II
private static void SaveApplicationState(Stream stream) { // Construct a serialization formatter that does all the hard work BinaryFormatter formatter = new BinaryFormatter(); // Serialize our application's entire state formatter.Serialize(stream, s_customers); formatter.Serialize(stream, s_pendingOrders); formatter.Serialize(stream, s_processedOrders); }
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