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foreach (KeyValuePair<Control, string> item in contextIDs) { Register(item.Key); } } As you can see, the EndInit() method simply steps through the collection of controls and registers everything it finds. This makes sense if there s a control in the collection at this time, it must have been added at design time, and the PictureBox hasn t been set up yet. The heavy lifting is performed in the Register() method. It creates the PictureBox, adds it to the form, and registers for the PictureBox.DoubleClick event. Notice that the PictureBox image is drawn from a resource in the assembly that contains the HelpIconProvider. To further refine the provider, you could handle more events from the dynamically generated picture box, perhaps tailoring the mouse cursor when it is positioned over the picture box. private void Register(Control control) { // Create new PictureBox. PictureBox pic = new PictureBox(); pic.Image = Properties.Resources.help; pic.Size = new Size(16, 16); pic.Location = new Point(control.Right + 10, control.Top); // Register for DoubleClick event. pic.DoubleClick += new EventHandler(PicDoubleClick); // Store a reference to the help icon // So you can remove it later. pictures[control] = pic; // Add it to the form. control.Parent.Controls.Add(pic); }

5. This abstraction generally leads to a loose coupling, or dependence, of related function sets to each other. In general, MySQL s components are loosely coupled, with a few exceptions.

Tip Self-tuning is a feature of the Oracle database (enabled by default) that can dynamically adjust the statement cache size on its own to improve application performance. When it is enabled, the automatically determined statement cache size will overwrite any other statement cache size setting. For this reason, you must set it to false if you want to define a fixed statement cache size of your own.

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Tip This extender works by adding another control to the form. Instead of taking this approach, you could draw the icon by hand. In order to do this correctly, your extender would need to hook into two events: the Form.Paint event (to repaint the help icon) and the Form.DoubleClick event (to hit-test and see if the help icon was double-clicked).

Storage engine abstraction layer Storage engine implementations MyISAM handler and library MEMORY handler and library NDB cluster handler and library

You can also control the statement cache programmatically through ODP.NET. For example, you might have enabled statement caching on a connection instance but do not wish to cache a particular statement (maybe because it is rarely called, and you prefer not to have it take up any cache slots). You can tell ODP.NET whether to add a statement to the cache or not by setting the OracleCommand.AddToStatementCache property to either true or false, in the fashion shown here:

The UnRegister() method, which is called when an empty string is passed to the SetHelpID() method, detaches the event handler and disposes the PictureBox.

All of MySQL s subsystems share the use of a base library of common functions. Many of these functions exist to shield the subsystem (and the developers) from needing to operate directly with the operating system, main memory, or the physical hardware itself.6 Additionally, the base function library enables code reuse and portability. Most of the functions in this base library are found in the C source files of the /mysys and /strings directories. Table 4-2 shows a sampling of core files and locations for this base library. Table 4-2. Some Core Function Files

private void UnRegister(Control control) { // Detach event handler. pictures[control].DoubleClick -= new EventHandler(PicDoubleClick); // Remove the picture from the form. pictures[control].Dispose(); control.Parent.Controls.Remove(pictures[control]); pictures.Remove(control); } For good form, you should remove all PictureBox references when the provider is disposed. Of course, you could still get a fair bit more paranoid and perform even more cleanup work, but this is sufficient to keep the HelpIconProvider well-behaved. protected override void Dispose(bool disposing) { if (disposing) { // Dispose all the PictureBox controls. foreach (KeyValuePair<Control, PictureBox> item in pictures) { item.Key.Dispose(); } } } Lastly, the GetHelpID() method is as simple as ever it simply retrieves the relevant Help context ID: public string GetHelpID(Control extendee) { if (contextIDs.ContainsKey(extendee)) { return contextIDs[extendee]; } else { return String.Empty; } } When the PictureBox.DoubleClick event occurs, the HelpIcon provider searches for the matching control. Then it launches the Help file with the appropriate context identifier.

OracleCommand _cmdObj = _connObj.CreateCommand();

private void Binding_PositionChanged(object sender, System.EventArgs e) { UpdateProducts(); } private void UpdateProducts() { string filter; DataRow selectedRow; // Find the current category row. selectedRow = ds.Tables["Categories"].Rows[categoryBinding.Position]; // Create a filter expression using its CategoryID. filter = "CategoryID='" + selectedRow["CategoryID"].ToString() + "'"; // Modify the view onto the product table. ds.Tables["Products"].DefaultView.RowFilter = filter; } The result is a perfectly synchronized master-detail list. You could adapt this example to work with two separate forms without much trouble. You simply need to design a way for the parent form to communicate with the child form, by setting a public property or calling a method.

/mysys/array.c /mysys/hash.c/.h /mysys/mf_qsort.c /mysys/string.c /mysys/my_alloc.c /mysys/mf_pack.c /strings/*

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