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So that you can read the contents of controls placed on the callee form s surface, the con trols in the callee form must be non-Private. You decide the scope of a control by setting the Modifiers property in the Properties window. This property can be Public, Protected, Friend, or Private. Because the default value for this property is Friend, you have to worry about this detail only if your form is going to be used from another assembly. However, for a cleaner object-oriented design and better data encapsulation, you might decide to use a narrower scope for your controls for example, Private. (Or you might use Protected if you plan to use the form as a base class for inherited forms, as I ll explain in the section Form Inheritance in this chapter.) Using a narrower scope is usually a wiser decision because you don t expose details of your form class to the outside and you can later change its internal implementation for example, by replacing a TextBox control with a ComboBox control without any impact on code that creates and uses instances of the form. Another benefit of not exposing controls to the outside world is that caller code can t accidentally enter invalid values in the controls. If you use private controls, you must provide the caller code with a way to read their contents. You can do this easily by wrapping the controls in a property procedure, as in this code:

It is not sufficient to simply configure your system to meet the space requirements. As you have seen throughout this chapter, how you configure the I/O subsystem can significantly enhance or severely degrade the performance of your system. However, determining the performance requirements of your I/O subsystem is not nearly as easy as determining the space requirements. The best way to determine performance requirements is to look at a similar application or system. This data can give you a starting point for estimating future requirements. You will learn much more about this in 6. Assuming that you find a similar system, you can then use data gathered from that system and the information earlier in this chapter to determine the number of disk drives required. Remember to take into account the RAID level that will be used on that I/O subsystem. The next steps are planning the SQL Server disk layout and then implementing the solution.

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The BoundField class represents a field that is displayed as plain text in a data-bound control such as GridView or DetailsView. To specify the field to display, you set the DataField property to the field s name. You can apply a custom formatting string to the displayed value by setting the DataFormatString property. The NullDisplayText property lets you specify alternative text to display should the value be null. Finally, by setting the ConvertEmptyStringToNull property to true, you force the class to consider empty strings as null values. A BoundField can be programmatically hidden from view through the Visible property, while the ReadOnly property prevents the displayed value from being modified in edit mode. To display a caption in the header or footer sections, set the HeaderText and FooterText properties, respectively. You can also choose to display an image in the header instead of text. In this case, you set the HeaderImageUrl property.

ShouldSerializexxxx (where xxxx is the name of the property) that returns True if the property must be serialized and False if its current value is equal to its default value:

Figure 15-2

Check const raint s ar e am ong t he m ost sim ple of t he const raint t ypes available t o dat abase dev elopers and adm inist rat ors Basically, a check const raint allows you t o r est r ict t he values ent er ing a colum n som ewhat in t he way t hat dat a t ype specificat ions do ( Users cannot ent er a charact er st ring int o a colum n wit h an int dat a t ype) However, check const raint s base t heir r est r ict ion on a Boolean expression t hat evaluat es t o Tr ue or False The const raint expr ession can draw on one or m or e colum n values fr om t he t able t o w hich it applies.

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