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You can also derive a custom control designer to use with your custom controls. Why would you create your own designer To add design-time conveniences, like context menu options and smart tags. To remove inappropriate events or properties from view (or add design-time-only events or properties). To tailor the design-time appearance of the control so that it differs from the runtime appearance (for example, adding a border around an empty panel). To add support for controls that contain other controls (like the toolbar) or controls with special design-time needs (like menus). At design time, the designer infrastructure attaches a designer to each component as it is sited on a form. (If more than one instance of the same component is added to a form, Visual Studio will reuse the same designer for all instances.) Once this connection is established, the control designer has the ability to take part in the interaction between the developer and the control. To create a basic control designer, begin by deriving a class from ControlDesigner (or ParentControlDesigner, if you want to create a container control that can hold child controls). Here s an example that creates a designer for the DirectoryTree control from 11: public class DirectoryTreeDesigner : ControlDesigner { ... } You can then add functionality to your control designer by overriding the built-in methods. When you re finished, you need to link the custom control designer to the appropriate control. To do this, you apply the Designer attribute to the control declaration and specify the appropriate designer type. Here s an example that links the DirectoryTreeDesigner to the DirectoryTree control: [Designer(typeof(DirectoryTreeDesigner))] public class DirectoryTree : TreeView { ... }

When this library is not available or not suited to the operating system, MySQL emulates POSIX threads by wrapping an operating system s available process or resource management library in a standard set of POSIX function definitions For instance, Windows uses its own common resource management functions and definitions Windows threads are known as handles, and so MySQL wraps, or redefines, a HANDLE struct to match a POSIX thread definition Likewise, for locking shared resources, Windows uses functions like InitializeCriticalSection() and EnterCriticalSection() MySQL wraps these function definitions to match a POSIX-style API: pthread_mutex_init() and pthread_mutex_lock() On server initialization, the function init_thread_environment() (in /sql/mysqldcc) is called This function creates a series of lock structures, called mutexes, to protect the resources used by the various threads executing in the server process Each of these locks protects a specific resource or group of resources.

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MessageBox.Show(ex.ToString(), "Error connecting to Oracle"); } } Let s take a closer look at what you ve just written. The OracleConnection class is the ODP.NET class used to establish a connection to the database. The connection string you ve written is the standard vanilla one and consists of three parts: Data Source: The net service name of the database; in this case, NEWDB, the starter database that was created during your installation of the Oracle database in this example User ID: A valid database username Password: A valid database password

Tip Instead of supplying a type, you can use a different constructor overload that accepts a string with a full assembly name. This is handy, because it allows you to separate the runtime and design-time code for your custom control. If you develop extensive design-time support, this ensures that the runtime version of your control remains as small as possible.

A designer can be as complex or as simple as you want. In the following sections, you ll see a number of techniques you can use with control designers. Although these topics are by no means comprehensive, they provide a good overview of what you can accomplish.

When a thread needs to modify or read from the resource or resource group, a call is made to lock the resource, using pthread_mutex_lock() The thread modifies the resource, and then the resource is unlocked using pthread_mutex_unlock() In our walk-through of a typical query execution at the end of this chapter, you ll see an example of how the code locks and unlocks these critical resources (see Listing 4-10) Additionally, the functions exposed by this subsystem are used by specific threads in order to allocate resources inside each thread This is referred to as thread-specific data (TSD) Table 4-3 lists a sampling of files for thread and process management Table 4-3 Some Thread and Process Management Subsystem Files.

If you run this code and click the button you ve just created, you get the Connection successful! message shown in Figure 3-2 (assuming you have installed the Oracle database correctly and set the correct connection string). Congratulations, you have just written your first ODP.NET application!

Note When you derive a custom control from an existing .NET control, you automatically acquire the same control designer as the base class. This is significant, because many controls (including the TreeView) have custom designers. However, you can reapply the Designer attribute to choose a different designer for your custom control.

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