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<asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString="<%$ ConnectionStrings:NorthwindConnectionString %>" SelectCommandType="Text" SelectCommand="SELECT * FROM [products]" DataSourceMode="DataReader"> </asp:SqlDataSource> <asp:GridView ID="GridView1" runat="server" DataSourceID="SqlDataSource1"> </asp:GridView>

CookieSlidingExpiration Indicates whether the cookie has a fixed expiration time or a sliding expiration. CookieTimeout Enabled Provider Providers Returns the time, in minutes, after which the cookie will expire. Indicates whether role management is enabled. Returns the current role provider. Returns a list of all supported role providers.

Notice several changes in this new version . First, it now has two CompareTo methods . The first CompareTo method no longer takes an Object as a parameter; it now takes a SomeValueType instead . Because this parameter has changed, the code that casts other to SomeValueType is no longer necessary and has been removed . Second, changing the first CompareTo method to make it type-safe means that SomeValueType no longer adheres to the contract placed on it by implementing the IComparable interface . So SomeValueType must implement a CompareTo method that satisfies the IComparable contract . This is the job of the second IComparable.CompareTo method, which is an EIMI . Having made these two changes means that we now get compile-time type safety and no boxing:

I just explained how delegates can be used to call static methods, but they can also be used to call instance methods for a specific object . To understand how calling back an instance method works, look at the InstanceDelegateDemo method that appears in the code shown at the beginning of this chapter . Notice that a Program object named p is constructed in the InstanceDelegateDemo method . This Program object doesn t have any instance fields or properties associated with it; I created it merely for demonstration purposes . When the new Feedback delegate object is constructed in the call to the Counter method, its constructor is passed p.FeedbackToFile . This causes the delegate to wrap a reference to the FeedbackToFile method, which is an instance method (not a static method) . When Counter calls the callback method identified by its fb argument, the FeedbackToFile instance method is called, and the address of the

Now all you have to do is read the return value from the service call:

there have been additional enhancements, the model has proved sufficiently flexible to meet the needs of most developers. In .NET, the way in which serialized data is stored is controlled by formatters, which are classes that implement the System.Runtime.Serialization.IFormatter interface. Two implementations are available in the .NET Framework:

Wizards are typically used to break up large forms to collect user input. A wizard is a sequence of related steps, each associated with an input form and a

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Lesson 1: Understanding TCP/IP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-2 Lesson 2: Understanding IP Addressing . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-7 Lesson 3: Subnetting and Supernetting IP Networks . . . . . . . . . . . . . . . . . . .2-22 Lesson 4: Installing and Configuring TCP/IP . . . . . . . . . . . . . . . . . . . . . . . . .2-42