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Usually applications use a number of images and strings for purposes such as toolbar or menu icons, menu captions, and label captions Changing those strings and images can get really ugly if you put them directly in the source code To make changing those strings and images in the program as easy as possible without having to go through the entire source code and search for them, you can put them in separate files and change them in only one place The NET Framework and the CLR offer great support for this approach through embedded resources You can put every string, image, and other type of data that should not exist directly in source code in separate resource files Usually these resources are compiled into the binaries of the application itself Therefore, they are automatically deployed with the application, and no extra deployment steps are necessary.

If you have an extremely large amount of data to display in a TreeView, you probably don t want to fill it in all at once. Not only will that increase the time taken to process the initial request for the page, it will also dramatically increase the size of the page and the view state. Fortunately, the TreeView includes a populate-on-demand feature that makes it easy to fill in branches of the tree as they are expanded. Even better, you can use populate-on-demand on selected portions of the tree, as you see fit. To use populate-on-demand, you set the PopulateOnDemand property to true for any TreeNode that has content you want to fill in at the last minute. When the user expands this branch, the TreeView will fire a TreeNodePopulate event, which you can use to add the next level of nodes. If you want, this level of nodes can contain another level of nodes that are populated on demand. Although the programming model remains fixed, the TreeView actually supports two techniques for filling in the on-demand nodes. When the TreeView.PopulateNodesFromClient property is true (the default), the TreeView performs a client-side callback to retrieve the nodes it needs from your event, without posting back the entire page. If PopulateNodesFromClient is false, or if it s true but the TreeView detects that the current browser doesn t appear to support client callbacks, the TreeView triggers a normal postback to get the same result. The only difference is that the entire page will be refreshed in the browser, generating a less seamless interface. (It also allows other page events to fire, such as control change events.)

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SQL Server and Oracle connection pools are always maintained as part of the global resources in an application domain. As a result, all the connections are lost if the application domain is restarted (for example, because of an update or in response to a certain threshold being reached). For the same reason, connection pools can t be reused between separate web applications on the same web server or between web applications and other .NET applications.

The primary use case for resources is localization Using resources, you can define values for control properties (such as the text of a Label control) in different resource files one for each culture the application supports Each of these resource files contains strings (key/value pairs) for the localized properties of the control translated into the corresponding culture At runtime the CLR loads these resources from the appropriate embedded resource files and applies them to the control s properties But localization is not the only useful application for resources In Windows applications, resources are also used for toolbar, menu, and status icons so that they don t need to be deployed separately with the application (which is not common for web applications).

34 has more information about how client callbacks work and how you can use them directly. However, the TreeView support is particularly nice because it hides the underlying model, allowing you to write an ordinary .NET event handler.

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