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Now you know how to access and read the configuration settings. The next part is to alter the values and save the changes back to the web.config file. This functionality leverages on the classes and namespaces we mentioned and used earlier. When changing the value of the original key to the newly desired value, the Save() method is called, and then the settings are changed in the web.config value. For this example, you will add a textbox, label, and a command button to the web page. When the page loads, the SearchEngine value will be displayed in the text of the label. You will then be able to enter a new value into the textbox and click the command button to update the settings. Let s look at the actual code: Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load If Not Page.IsPostBack Then Dim config As System.Configuration.Configuration config = System.Web.Configuration.WebConfigurationManager. OpenWebConfiguration("/CH10API")

Every managed type falls into one of two categories: reference types or value types The difference between value types and reference types is that value types have value semantics while reference types have reference semantics Value semantics means that when an object is assigned (or passed as a parameter), it is copied byte for byte Reference semantics means that when an object is assigned (or passed as a parameter), the object is not copied; instead, another reference to that same object is created Value types are used for objects that represent a value, like a primitive type or a simple aggregate (eg, a small structure), especially one that is to be used in mathematical computations.

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Lifecycle of the Java Virtual Machine The Java Virtual Machine runs as an application on top of the host operating system. In this section we discuss the basic lifecycle of a JVM and the tasks it performs. The basic activities during the lifecycle of the virtual machine are starting up, loading classes, linking, creating new objects and shutting down. Starting up The JVM begins execution by loading a designated application class. This class must define a public static void main(String[] args) method. Once the virtual machine is running and this first class is loaded, the main method is invoked.

Computations with value types are more efficient than with reference types because reference types incur an extra level of indirection; reference types exist on the heap and can only be accessed through the handle, while the value type holds its value directly Value types actually live in a limited scope, either as an automatic variable at function scope or in the scope of another object as a field They also do not have the overhead of an object header, as reference types do However, value types are limited in many ways Value types are often copied for example, when used as a method parameter, a copy is automatically created so they are not suitable for large objects; they also cannot be used in inheritance hierarchies, and they don t support more complex and powerful object operations such as copy constructors, nontrivial default constructors, assignment operators, and so on.

download and install the gocr program. Then, after you scan an image, in the viewer window, select File OCR - Save As Text.

Select the Windows Project type, and then the Windows Forms Application Template. Give the project any name you want in the Name field, and then click OK. The new project has a single form (Form1) already for you to use. At this point, Visual Studio has already added about 250 lines of source code to your application. If you click on the Show All Files button in the Solution Explorer panel (described way back in 1, Figure 1-13) and open the various files in the project, you can see the code for yourself. Some of the most interesting code is in the Form1.Designer.vb file, slightly edited here:

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