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Public Sub New(name As String, price As Decimal) _name = name _price = price End Sub End Class ' This part is stored in file Product2.vb. Public Partial Class Product Public Function GetHtml() As String Dim htmlString As String htmlString = "<h1>" & _name & "</h1><br />" htmlString &= "<h3>Costs: " & _price.ToString() & "</h3><br />" htmlString &= "<img src=" & _imageUrl & ">" Return htmlString End Function End Class A partial class behaves the same as a normal class. This means every method, property, and variable you ve defined in the class is accessible everywhere, no matter which source file contains it. When you compile the application, the compiler tracks down each piece of the Product class and assembles it into a complete unit. It doesn t matter what you name the source code files, so long as you keep the class name consistent. Partial classes don t offer much in the way of solving programming problems, but they can be useful if you have extremely large, unwieldy classes. The real purpose of partial classes in .NET is to hide automatically generated designer code by placing it in a separate file from your code. Visual Studio uses this technique when you create web pages for a web application and forms for a Windows application.

When the design is clearly established, a team of programmers can work at the same time and implement the three tiers concurrently, which is one of the benefits of having a tiered architecture However, this rarely happens in practice, except for the largest projects that really need very careful design and planning In our case, usually the best way is to start with the lower levels (the database) to get the basics established before creating the user interface For this to happen, you need to analyze first what functionality is required for the user interface; otherwise, you won t know what to write in the data and business tiers Because you already have a working architecture, it will be simple to write components as needed for each tier.

Technically, you only need to use the Partial keyword on one of the class declarations. As long as the Tip

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As you can see, the default ProviderName is System.Data.SqlClient, so you don t need to specify it when you re connecting to a SQL Server database; the SqlDataSource assumes, unless you specify otherwise, that you re using a SQL Server database. However, if you re not connecting to a SQL Server database, as in the MySQL and Access examples in the code download, you must specify that you want to use a different provider. You add the ProviderName attribute to the SqlDataSource definition, like this:

Generics are a more subtle and powerful feature than partial classes. Generics allow you to create classes that are parameterized by type. In other words, you create a class template that supports any type. When you instantiate that class, you specify the type you want to use, and from that point on, your object is locked in to the type you chose. To understand how this works, it s easiest to consider some of the .NET classes that support generics. In the previous chapter, you learned how the ArrayList class allows you to create a dynamically sized collection that expands as you add items and shrinks as you

Of course, if you had to implement something new or more complicated, we would have spent some time analyzing the full implications, but here you won t do anything more complicated than the code in the previous chapters This being said, you ll implement all features for this chapter in the classical order, starting with the data tier..

remove them. The ArrayList has one weakness, however it supports any type of object. This makes it extremely flexible, but it also means you can inadvertently run into an error. For example, imagine you use an ArrayList to track a catalog of products. You intend to use the ArrayList to store Product objects, but there s nothing to stop a piece of misbehaving code from inserting strings, integers, or any arbitrary object in the ArrayList. Here s an example: ' Create the ArrayList. Dim products As New ArrayList() ' Add several Product objects. products.Add(product1) products.Add(product2) products.Add(product3) ' Notice how you can still add other types to the ArrayList. products.Add("This string doesn't belong here.") The solution is a new List collection class. Like the ArrayList, the List class is flexible enough to store different objects in different scenarios. But because it uses generics, you must lock it into a specific type whenever you instantiate a List object. To do this, you specify the class you want to use in parentheses, preceded by the word Of. So if you want to create a collection of products, you need this code statement: ' Create the List for storing Product objects. Dim products As New List(Of Product)() Now you can add only Product objects to the collection: ' Add several Product objects. products.Add(product1) products.Add(product2) products.Add(product3) ' This line fails. In fact, it won't even compile. products.Add("This string can't be inserted.") You can find the List class, and many more collections that use generics, in the System.Collections.Generic namespace. (The original ArrayList resides in the System. Collections namespace.)

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