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// Using string.Format() to format a string literal. string userMessage = string.Format("100000 in hex is {0:x}", 100000); // You would need to reference System.Windows.Forms.dll // in order to compile this line of code! System.Windows.Forms.MessageBox.Show(userMessage); } Notice how string.Format() returns a new string object, which is formatted according to the provided flags. After this point, you are free to use the textual data as you see fit.

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To implement a profiles provider, you need to create a class that derives from the ProfileProvider abstract class from the System.Web.Profile namespace. The ProfileProvider abstract class itself inherits the SettingsProvider abstract class from the System.Configuration namespace, which inherits from the ProviderBase abstract class from the System.Configuration.Provider namespace. As a result, you also need to implement members from the SettingsProvider and ProviderBase classes. Altogether, more than a dozen members must be implemented before you can compile your custom profiles provider. However, these methods aren t all of equal importance. For example, you can create a basic provider that saves and retrieves profile information by implementing two or three of these methods. Many of the other methods support functionality that s exposed by the ProfileManager class, such as the ability to delete profiles or find inactive profiles. In the following example, you ll consider a simple profiles provider that includes the core logic that s needed to plug into a page but doesn t support most other parts of the profiles API. Methods that aren t supported simply throw a NotImplementedException, like this:

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Like any programming language, C# defines an intrinsic set of fundamental data types, which are used to represent local variables, member variables, return values, and parameters. Unlike other programming languages, however, these keywords are much more than simple compiler-recognized tokens. Rather, the C# data type keywords are actually shorthand notations for full-blown types in the System namespace. Table 3-4 lists each system data type, its range, the corresponding C# keyword, and the type s compliance with the common language specification (CLS).

Note Recall from 1 that CLS-compliant .NET code can be used by any managed programming language. If you expose non CLS-compliant data from your programs, other languages may not be able to make use of it.

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Public Overrides Function DeleteProfiles(ByVal usernames As String()) As Integer Throw New Exception("The method or operation is not implemented.") End Function All of these methods are conceptually easy to implement (all you need is some basic ADO.NET code). However, properly coding each method requires a fairly substantial amount of code. Table 24-6 lists all the overridable properties and methods and indicates which class defines them. Those that are implemented in the following example are marked with an asterisk. To be considered truly complete, a provider must implement all of these members. Table 24-6. Abstract Methods for Profiles Providers

Table 3-4. The Intrinsic Data Types of C#

The ASP .NET server controls automatically use XHTML markup if the requesting browser supports HTML 4.0 or later. However, there may be rare cases when you want to disable XHTML-compliant rendering altogether. This might be the case if you have client-side JavaScript that relies on tags or attributes that aren t allowed in XHTML. To solve this problem, you can revert to the HTML rendering used in ASP.NET 1.x.

public class User { @Id @GeneratedValue(strategy = IDENTITY) @Column(name="user_id") private int userId; @Column(name="forename") private String forename; @Column(name="surname") private String surname; @OneToOne(cascade = CascadeType.ALL) @JoinColumn(name = "address_id") private Address address;

true or false 128 to 127 0 to 255 32,768 to 32,767 0 to 65,535 2,147,483,648 to 2,147,483,647 0 to 4,294,967,295

To revert to HTML-only rendering, you simple need to set the enableLegacyRendering attribute of the xhtml11Conformance element to True in your web.config file. Here s an example: <system.web> <xhtml11Conformance enableLegacyRendering="true" /> </system.web> When obsolete rendering is enabled, ASP .NET controls do not use any of the XHTML refinements that aren t strictly compatible with HTML 4.01. For example, they render standard HTML elements such as <br> instead of the correct XHTML version <br />. However, even if obsolete rendering is enabled, ASP.NET won t strip out the namespace in the <html> tag or remove the doctype if these details are present in your page.

Represents truth or falsity Signed 8-bit number Unsigned 8-bit number Signed 16-bit number Unsigned 16-bit number Signed 32-bit number

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