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One example is the ArrayList class introduced in the previous chapter. The ArrayList is designed in such a way that it can store any type of object. To have this ability, it treats all objects in the same way as instances of the root System.Object class. (All classes in .NET inherit from System.Object at some point, even if this relationship isn t explicitly defined in the class code.) The end result is that when you retrieve an object from an ArrayList collection, you need to cast it from a System.Object to its real type, as shown here: ' Create the ArrayList. Dim products As New ArrayList() ' Add several Product objects. products.Add(product1) products.Add(product2) products.Add(product3) ' Retrieve the first item, with casting. Dim retrievedProduct As Product = CType(products(0), Product) ' This works. Respose.Write(retrievedProduct.GetHtml()) ' Retrieve the first item, as an object. This doesn't require casting, ' but you won't be able to use any of the Product methods or properties. Dim retrievedObject As Object = products(0) ' This generates a compile error. There is no Object.GetHtml() method. Respose.Write(retrievedObject.GetHtml()) As you can see, if you don t perform the casting, you won t be able to use the methods and properties of the object you retrieve. You ll find many cases like this in .NET code, where your code is handed one of several possible object types and it s up to you to cast the object to the correct type in order to use its full functionality.

Tip By default, all visitors are allowed access to all pages, so you need to explicitly deny access to the

Note Occasionally, you might run into a custom method that converts an object to another data type.

System.Data.Odbc System.Data.OleDb System.Data.OracleClient System.Data.SqlClient System.Data.SqlServerCe

For example, you can use the ToString() method in many objects to get a string that s based on that object. However, this process isn t really a conversion instead, you re generating a representation of your object. This representation probably doesn t preserve all the data of your original object, and usually the conversion is one-way only.

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The department administration section will allow your client to add, remove, or change department information To implement this functionality, you ll need to write the code for the presentation, business, and data layers One fundamental truth regarding n-Tiered applications (which also applies to this particular case) is that the business and database tiers are ultimately created to support the presentation tier Drawing it on paper and establishing exactly how you want the site to look (in other words, what functionality needs to be supported by the user interface) will provide you with a good indication of what the database and business tier will contain With the proper design work, you would know exactly what to place in each tier, so the order of writing the code wouldn t matter.

Partial classes give you the ability to split a single class into more than one source code (.vb) file. For example, if the Product class becomes particularly long and intricate, you might decide to break it into two pieces, as shown here: ' This part is stored in file Product1.vb. Public Partial Class Product Private _name As String Private _price As Decimal Private _imageUrl As String Public Property Name() As String Get Return _name End Get Set(ByVal value As String) _name = value End Set End Property Public Property Price() As Decimal Get Return _price End Get Set(ByVal value As Decimal) _price = value End Set End Property Public Property ImageUrl() As String Get Return _imageUrl End Get Set(ByVal value As String) _imageUrl = value End Set End Property

Any data source that is accessed through an ODBC driver Any data source that is accessed through an OLE DB provider Provides native access to Oracle databases Provides native access to SQL Server databases (default value) Provides native access to SQL Server CE for the .NET Compact Framework

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