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ser controls allow you to build customized controls by combining the existing controls in the Windows Forms toolkit. Typically, a user control consists of a group of ordinary controls that are related in some way. For example, you might create a user control that models a simple record browser, combining navigation buttons with other display controls. Or, you could create a user control that wraps together related input fields and validators. The advantage is that you can build a user control in almost the same way as you build a full-fledged form. Although user controls are the simplest type of custom control project, they suffer from some serious drawbacks: User controls make it a little too easy for developers to combine business logic with an inflexible block of user interface. For example, if the application programmer doesn t like the way individual text boxes are arranged in an address user control, there s no easy way to change it. Similarly, if the underlying business logic needs to change, the control needs to be rebuilt and redistributed. Although you can solve these problems with good design, user controls tend to be more fragile and less flexible than other types of custom controls. Unless you take additional steps, user controls hide all the properties and methods of their child controls. This is similar to the way ActiveX controls worked in Visual Basic 6.

Figure 8-4. Diagram of the category tree, showing left_side and right_side values Listing 8-18 shows all the data we ll be working with in the Category table. Use this listing, along with Figure 8-4, to follow along with the upcoming examples. Listing 8-18. The Category Table Data mysql> SELECT category_id, name, left_side, right_side FROM Category; +-------------+---------------------------+-----------+------------+ | category_id | name | left_side | right_side | +-------------+---------------------------+-----------+------------+ | 1 | All | 1 | 28 | | 2 | Action Figures | 2 | 11 | | 3 | Sport Action Figures | 3 | 8 | | 4 | Tennis Action Figures | 4 | 5 | | 5 | Football Action Figures | 6 | 7 | | 6 | Historical Action Figures | 9 | 10 | | 7 | Video Games | 12 | 19 | | 8 | Racing Video Games | 13 | 14 | | 9 | Sports Video Games | 15 | 16 | | 10 | Shooting Video Games | 17 | 18 | | 11 | Sports Gear | 20 | 25 | | 12 | Soccer Equipment | 21 | 22 | | 13 | Tennis Equipment | 23 | 24 | | 14 | Dolls | 26 | 27 | +-------------+---------------------------+-----------+------------+ 14 rows in set (0.00 sec)

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OracleDataReader.FetchSize = OracleCommand.RowSize * rowsNeeded;

That said, user controls are useful for quickly solving certain problems and creating composite controls. They also have one great benefit you can use the design support in Visual Studio to add, configure, and lay out child controls inside a user control. This makes it possible to create a simple composite control very quickly.

To add a user control to a .NET custom control project, right-click the Solution Explorer window and select Add User Control. Figure 10-1 shows a user control in the Solution Explorer. To add a control to a user control, just drop it onto the design surface in the same way as you would a form. You can (and should) use anchoring and docking with the controls in your user control. That ensures that they always resize to fit the bounds of their container. Remember, the size of the user control is dictated by the application programmer. You ll notice from the designer that a user control is halfway between an ordinary control and a form. It helps to imagine that a user control is just a reusable portion of a form. In fact, user controls inherit from all the same base classes as forms (described in 3).

Now, you re ready to look at how to accomplish the following common chores using the nested set technique: Find the depth of a node Find all nodes under a specific parent Find all nodes above a specific node Summarize across the tree Insert a node into the tree Remove a node from the tree

In Listing 12-10, you can see performance gains when you attempt to retrieve 10,000 rows from the Products table when you change your FetchSize to fetch for instance, all 10,000 rows in one round-trip. Listing 12-10. Fetching 10,000 Rows from the Database with Different FetchSizes

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