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Since the data layer effectively manages all underlying data sources, it must be able to manage data source settings, such as connection strings and provider types. As connection settings are typically stored outside the data layer (for example, in the registry or an external file such as app.config), you should also think of a good security model to use to protect this information.

There are two panel controls for custom layout. The FlowLayoutPanel is the simpler of the two. The FlowLayoutPanel arranges controls one after the other in the available space. It s similar to the approach usually used with web pages, where each element is positioned immediately after the preceding element. To try out a FlowLayoutPanel, drag it onto a form and start adding some controls. The FlowLayoutPanel adds two new properties to the Panel class: FlowDirection. This property determines how the controls are laid out in sequence (for example, from top to bottom). Table 21-1 lists the supported values. WrapContents. If true, this allows the layout control to wrap controls once they extend beyond the boundary specified by FlowDirection. For example, if you re laying out items from left to right and you set WrapContents to true, items will be added in a new left-toright row underneath when the first row is full. If WrapContents is false, everything will be added into the first row, but items that extend beyond the boundaries of the panel will be clipped or hidden.

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value ! = 2

Elements flow from the bottom of the panel to the top. Elements flow from the left edge of the panel to the right. This is the default. Elements flow from the right edge of the panel to the left. Elements flow from the top of the panel to the bottom.

Summary

value < 2 Set upper bound = current record number (the cut-to record s index in the set)

Once you re familiar with these two properties, there s not much more you need to know about the FlowLayoutPanel. Figure 21-8 shows two examples where multiple buttons are placed in FlowLayoutPanel. In the first case, wrapping is enabled. In the second, it isn t. In both examples, a border is displayed around the FlowLayoutPanel, although this isn t required.

Figure 21-8. Wrapping the contents of a FlowLayoutPanel When you add FlowDirection to the mix, you have a few more interesting possibilities. Figure 21-9 shows two different wrapping orders.

Set lower bound = current record number (the cut-to record s index in the set)

In this chapter, you ve taken a look at some of the design concepts and patterns you can adopt to write data layers that adapt better to changing business requirements: The data access object (DAO) design concept and how it applies to the data layer Extending the data access application block in the Microsoft Enterprise Library Creating and using an ODP.NET DAO

Figure 21-9. Changing the flow direction The FlowLayoutPanel follows a single, simple rule controls can never overlap. That means if you are wrapping multiple lines of controls, the second line is space according to the highest control in the first line (as shown in Figure 21-10). No attempt is made to make all the lines the same height if you need that sort of functionality, you need the TableLayoutPanel instead.

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