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ClearPool(), you supply a SqlConnection, and all the matching connections are removed. ClearAllPools() empties out every connection pool in the current application domain. (Technically, these methods don t close the connections. They just mark them as invalid so that they will time out and be closed during the regular connection cleanup a few minutes later.) This functionality is rarely used typically, the only case it s useful is if you know the pool is full of invalid connections (for example, as a result of restarting SQL Server) and you want to avoid an error.

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.

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Allows the user or group all privileges associated with Read, Read & Execute, and Write, as well as the ability to delete a file or folder. Allows the user or group complete control over the file, including the ability to change permissions for users or groups and to take ownership of the file. This is a folder specific permission that gives the user rights to view the files and folders inside of a folder. There are a total of 13 permission settings accessible from the Advanced button that allow for a more granular control of permissions. If you set any special permissions using these more detailed settings, then the Special Permissions check boxes may be checked. This indicates that you must go to the Advanced settings to view all the actual permissions.

In some cases, you might want to track the status of a variable without switching into break mode repeatedly. In this case, it s more useful to use the Locals, Autos, and Watch windows, which allow you track variables across an entire application. Table 2-6 describes these windows. Table 2-6. Variable Tracking Windows

The URL string did not display in the previous attempts, because we navigated to the same page through the postback mechanism enforced by the HtmlInputForm control and its <form> tag generation, which uses an HTTP POST. The URL string state mechanism is activated in our demonstration only through clicking the hyperlink on the web form. Figure 3-7 displays the values from the URL string but loses the information that was available for our HTML hidden variable and ViewState. The reason for the change in behavior is a switch from an HTTP POST request using the postback mechanism to an HTTP GET request by clicking the hyperlink. Because we bypassed the form postback with an HTTP GET, all values

Automatically displays all the variables that are in scope in the current procedure. This offers a quick summary of important variables. Automatically displays variables that Visual Studio determines are important for the current code statement. For example, this might include variables that are accessed or changed in the previous line. Displays variables you have added. Watches are saved with your project, so you can continue tracking a variable later. To add a watch, right-click a variable in your code, and select Add Watch; alternatively, double-click the last row in the Watch window, and type in the variable name.

You can add an account by clicking on the Add button under the user and groups listing. This displays the Select Users or Groups dialog box shown in Figure 12-19. Notice the three entry fields on the form. I ll start with the last entry field on the form and work backwards from there.

Each row in the Locals, Autos, and Watch windows provides information about the type or class of the variable and its current value. If the variable holds an object instance, you can expand the variable and see its private members and properties. For example, in the Locals window you ll see the this variable, which is a reference to the current page class. If you click the plus symbol next to this, a full list will appear that describes many page properties (and some system values), as shown in Figure 2-26.

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