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1. In the Designer, double-click the button you want to write code for. Visual Stu dio automatically generates a method declaration named Button_Click and adds code behind-the-scenes to configure the method to handle the Button.Click event. Visual Studio displays the new Button_Click method that will run when the user clicks the button. 2. Write the appropriate code in this method. At run time, this code will be executed when the button is clicked. The following code shows an example of a complete Button_Click method.

To complete the lessons in this chapter, you should be familiar with Microsoft Visual Basic or C# and be comfortable with the following tasks:

Do you know what the key terms mean You can check your answers by looking up the terms in the gloassary at the end of the book.

In the following case scenarios, you will apply what you ve learned about how to use controls to design user interfaces. You can find answers to these questions in the Answers section at the end of this book.

All practices in this chapter assume that Control Panel opens with the default (category) view. If Control Panel is showing the Classic view, click Control Panel Home in the left pane.

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At the most basic level, you can make a method accessible through a Web service application by attaching the WebMethod attribute to a public method. The public method is stored in the class file of your Web service file (the one with the .asmx extension). When you create a Web service project using the Web service project tem plate, one public method named HelloWorld is created for you by default. You can see the code for the HelloWorld method by right-clicking the Service.asmx file in Solution Explorer and clicking View Code.

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it first calculates how much space you will be able to free up on the computer s disk drive. 2. If the computer has multiple partitions, in the Select Drive dialog box, select the drive to clean up from the drop-down list. If this is the first time the drive is being cleaned and more than one drive or partition exists, choose the system partition first. Click OK. 3. In the Disk Cleanup dialog box, review the files to be deleted. Click to choose a file type to delete, and select the Recycle Bin check box to empty it also. Figure 2-6 shows an example. Click OK when finished. 4. Click Yes to verify that you want to perform these actions.

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Internal objects are created by the SQL Server database engine as it processes SQL Server statements. Objects are created and dropped within the scope of the statement. Internal objects include the following items:

The first page in an object does not have a previous page, so the entry will be set to 0:0. The last page of the object does not have a next page entry, so the value will be set to 0:0. When a value of 0:0 for the next page is located, SQL Server does not have to read any further. What does the page chain structure have to do with partitioning When a table is par titioned, the data is physically sorted, split into sections, and stored in filegroups. From the perspective of the page chain, SQL Server finds the first page of the object in Partition 1, walks the page chain, reaches the last page in Partition 1, which points to the first page in Partition 2, and so on through the rest of the table. By creating a physical ordering of the data, an interesting possibility becomes available. If you were to modify the page pointer on the last page of Partition 1 to have a value of 0:0 for the next page, SQL Server would not read past it, and it would have the effect of causing data to disappear from the table. There would not be any blocking or deadlocking because a simple metadata-only operation occurred to update the page pointer. The basic idea for a metadata operation is shown in Figure 14-3.

nection or by type in Device Manager. To locate the IRQ number for a particular device in other views, the specific device properties must be viewed.