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Choose Debug Windows Breakpoints to see a window that lists all the breakpoints in your current project. The Breakpoints window provides a hit count, showing you the number of times a breakpoint has been encountered (see Figure 2-25). You can jump to the corresponding location in code by double-clicking a breakpoint. You can also use the Breakpoints window to disable a breakpoint without removing it. That allows you to keep a breakpoint to use in testing later, without leaving it active. Breakpoints are automatically saved with the hidden solution file described earlier.

Web forms and controls have different methods to obtain a reference to the HttpContext instance. A static property, HttpContext.Current, returns an instance of the current HttpContext to any class that is interested, even if it is not inside an ASP.NET page. For example, the Current static property can be referenced in helper classes used within the web form page s server-side code to gain access to any of the properties in Table 3-2, such as Cache. This ease of access allows for more modular code that s easier to read. Controls inherit a Context property from System.Web.UI.Control that is mapped to the current instance of HttpContext as a convenient reference for use in server control development. The Page class has a Context property as well, but it goes one step further by providing properties that are mapped to their Context counterparts, such as Request and Response.

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Figure 2-25. The Breakpoints window Visual Studio allows you to customize breakpoints so they occur only if certain conditions are true. To customize a breakpoint, right-click it, and select Breakpoint Properties. In the window that appears, you can take one of the following actions: Click the Condition button to set an expression. You can choose to break when this expression is true or when it has changed since the last time the breakpoint was hit. Click the Hit Count button to create a breakpoint that pauses only after a breakpoint has been hit a certain number of times (for example, at least 20) or a specific multiple of times (for example, every fifth time).

You can choose to allow or deny access to an application based on the network address of the requestor. To do so, click on the Edit button in the IP address and domain name restrictions section of the Directory Security tab (visible in Figure 12-9). This displays the IP Address and Domain Name Restriction dialog box shown in Figure 12-10.

If you re using a database other than SQL Server, you might need to consult the data provider documentation (or the .NET Framework class library reference) to determine the supported connection string values. For example, most databases support the Connect Timeout setting, which sets the number of seconds to wait for a connection before throwing an exception. (The SQL Server default is 15 seconds.)

When you create a Connection object, you can pass the connection string as a constructor parameter. Alternatively, you can set the ConnectionString property by hand, as long as you do it before you attempt to open the connection.

Note Only Windows NT and Windows Server 2003 allow you to specify IP and Domain Restrictions. You can t set up restrictions on Windows XP. If you view the Directory Security tab in Windows XP, the Edit button for the IP and domain restrictions is disabled.

In general, we do not recommend using server-side state management techniques in server control development, especially when most, if not all, state storage requirements can be met using client-side state management, which we discuss in the next section. In situations where server-side state is feasible and the limitations, such as requiring browser cookies, are acceptable, server-side state can be a convenient method to store state for custom controls. However, in this book, we do not use server-side state management techniques in any of the samples, because doing so would require developer users of the server controls to enable server-side state in order for the controls to work. Forcing server-side state on users is not a good practice and would limit the desirability of the server controls.

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