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Listing 1-2 provides an example of all the steps needed to create and execute a tablevalued function. First, we do some cleanup work just in case we run the script multiple times, but the real work begins in the second section of the script where we create the user-defined table type CustomerPreferenceTableType. Once we have the user-defined table type, we create the CustomerPreferences_Insert stored procedure, which accepts a parameter that we defined using the CustomerPreferencesTableType data type. Next, we create a variable that uses the CustomerPreferencesTableType data type, load some sample data to the variable, and then execute the CustomerPreferences_Insert stored procedure passing the variable we just created. Finally, we query the CustomerPreferences table to show that multiple records were actually inserted into the table with only a single call to the insert stored procedure. Listing 1-2. Sample Script Demonstrating the Use of Table-Valued Parameters USE tempdb --1. Prep work --Drop objects IF OBJECT_ID('CustomerPreferences') IS NOT NULL DROP TABLE CustomerPreferences; GO IF OBJECT_ID('CustomerPreferences_Insert') IS NOT NULL DROP PROCEDURE CustomerPreferences_Insert; GO IF EXISTS (SELECT * FROM sys.types st JOIN sys.schemas ss ON st.schema_id = ss.schema_id WHERE st.name = N'CustomerPreferenceTableType' AND ss.name = N'dbo') DROP TYPE [dbo].[CustomerPreferenceTableType]

So far, all the attributes you ve seen map to properties. However, attributes can also be used to attach event handlers. The syntax for this is EventName="EventHandlerMethodName". For example, the Button control provides a Click event. You can attach an event handler like this: <Button ... Click="cmdAnswer_Click"> This assumes that there is a method with the name cmdAnswer_Click in the codebehind class. The event handler must have the correct signature (that is, it must match the delegate for the Click event). Here s the method that does the trick: private void cmdAnswer_Click(object sender, RoutedEventArgs e) { AnswerGenerator generator = new AnswerGenerator(); txtAnswer.Text = generator.GetRandomAnswer(txtQuestion.Text); } In many situations, you ll use attributes to set properties and attach event handlers on the same element. Silverlight always follows the same sequence: first it sets the Name property (if set), then it attaches any event handlers, and lastly it sets the properties. This means that any event handlers that respond to property changes will fire when the property is set for the first time.

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Tip If you use a scale with positive numbers only, such as 1 to 10, when computing an overall score, you ll need to remember to subtract the score for negative factors instead of adding them. Using negative numbers for the relative weight may seem a bit confusing, but it simplifies the subsequent computation.

Now that you ve considered the fundamentals of XAML, you know enough to walk through the definition for the page in Figure 2-1. Here s the complete XAML markup: <UserControl x:Class="EightBall.MainPage" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"> <Grid x:Name="grid1"> <Grid.RowDefinitions> <RowDefinition Height="*" /> <RowDefinition Height="Auto" /> <RowDefinition Height="*" /> </Grid.RowDefinitions> <TextBox VerticalAlignment="Stretch" HorizontalAlignment="Stretch" Margin="10,10,13,10" x:Name="txtQuestion" TextWrapping="Wrap" FontFamily="Verdana" FontSize="24" Grid.Row="0" Text="[Place question here.]"> </TextBox> <Button VerticalAlignment="Top" HorizontalAlignment="Left" Margin="10,0,0,20" Width="127" Height="23" x:Name="cmdAnswer" Click="cmdAnswer_Click" Grid.Row="1" Content="Ask the Eight Ball"> </Button> <TextBox VerticalAlignment="Stretch" HorizontalAlignment="Stretch" Margin="10,10,13,10" x:Name="txtAnswer" TextWrapping="Wrap" IsReadOnly="True" FontFamily="Verdana" FontSize="24" Foreground="Green" Grid.Row="2" Text="[Answer will appear here.]"> </TextBox> <Grid.Background> <LinearGradientBrush> <LinearGradientBrush.GradientStops> <GradientStop Offset="0.00" Color="Yellow" /> <GradientStop Offset="0.50" Color="White" /> <GradientStop Offset="1.00" Color="Purple" /> </LinearGradientBrush.GradientStops> </LinearGradientBrush> </Grid.Background> </Grid> </Window> Remember, you probably won t write the XAML for a graphically rich user interface by hand doing so would be unbearably tedious. However, you might have good reason to edit the XAML code to make a change that would be awkward to accomplish in the designer. You might also find yourself reviewing XAML to get a better idea of how a page works.

GO --Create table to hold results from procedure CREATE TABLE CustomerPreferences (CustomerID INT, PreferenceID INT) GO --2. Create table type CREATE TYPE CustomerPreferenceTableType AS TABLE ( CustomerID INT, PreferenceID INT ); GO --3. Create procedure CREATE PROCEDURE CustomerPreferences_Insert @CustomerPrefs CustomerPreferenceTableType READONLY

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