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Part of the art of object-oriented programming is determining class relations. For example, you could create a Product object that contains a ProductFamily object or a Car object that contains four Wheel objects. To create this sort of class relationship, all you need to do is define the appropriate variable or properties in the class. This type of relationship is called containment. For example, the following code shows a ProductCatalog class, which holds an array of Product objects: Public Class ProductCatalog Private _products() As Product ' (Other class code goes here.) End Class

Unlike the SELECT query, which just retrieves data, these three queries must obey the rules you created when you built the database and created relationships between tables. What was the data type for this column What was its maximum length Was it a key Can it be null The onus is on you to make sure that the data you try to add to a table obeys its rules. As with dealing with data for display, the basics are straightforward, but you need to expend a little more effort to make the page user-friendly (and idiot-proof).

Browsable(True|False)

Also, the way output caching should be implemented depends on the exact stage of your web site. For now, you shouldn t use output caching, but only keep its possibilities in mind. You can start improving performance and tweaking your Web Forms or Web User Controls after you have a working Web Application.

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If False, this property doesn t appear in the Properties window (although the programmer can still modify it in code or by manually adding the control tag attribute, as long as you include a Set property procedure). Provides a string that indicates the category under which the property appears in the Properties window. Provides a string that indicates the description the property has when selected in the Properties window. Sets the default value that is displayed for the property in the Properties window. If True, Visual Studio displays parentheses around this property in the Properties window (as it does with the ID property). Determines what the control tag looks like when you drop the control into a page from the Toolbox. Usually, the tag takes the format <TagPrefix:ClassName> as in <apress:NameTextBox>. However, you can tweak this so the tag name is different from the class name. To do so, use this attribute and a string in the format "<{0}:NameTextBox runat=server></{0}:NameTextBox>" where {0} represents the tag prefix and everything else is entered as is.

You ll always have information to change and new data to collect, so providing a way to add new information to your databases is pretty crucial. Some sites may hide this functionality away in an administration section. How inserting data is handled depends on what the database models and who is logged on. For instance, Amazon hides the functionality to add new product information from you, the public, but it does let you add new feedback, and user information to its database, provided you re logged in. Similarly, eBay allows anyone to add a new auction to its database, but only the auctioneer can change those details. Security, then, is also a very important issue to consider.

Category("") Description("") DefaultValue() ParenthesizePropertyName(True|False)

For controls whose output also depends on the CategoryIndex, such as CategoriesList.ascx and Catalog.ascx, you can implement caching like this: <%@ OutputCache Duration="1000" VaryByParam="DepartmentIndex;CategoryIndex" %> Because ProductsList.ascx has many output versions (especially if you take searching into account), it s not recommended to implement caching for it. However, if you still want to do this, you need to make it vary on every possible query string parameter that could influence its output, with an OutputCache directive like this: <%@ OutputCache Duration="1000" VaryByParam="DepartmentIndex;CategoryIndex;Search;AllWords;PageNumber; ProductsOnPage" %> Alternatively, the * wildcard can be used to vary the output cache on any possible query string parameter: <%@ OutputCache Duration="1000" VaryByParam="*" %>

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