make barcode with vb.net Answers to Quizzes and Exercises in Visual C#

Print Code128 in Visual C# Answers to Quizzes and Exercises

Appendix: Answers to Quizzes and Exercises
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Example A-56. One solution to Exercise 19-1 (continued)
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<Button Style="{StaticResource buttonStyle}" Height="23" HorizontalAlignment="Right" Margin="0,0,37,56" Name="button3" VerticalAlignment="Bottom" Width="75">Button3</Button> <TextBox Style="{StaticResource textboxStyle}" Height="23" Margin="19,0,139,55.48" Name="textBox3" VerticalAlignment="Bottom">TextBox3</TextBox> </Grid> </Window>
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Solution to Exercise 19-2. Now you ll create your own animation. Create a WPF application with a single Button control (it doesn t have to do anything). Add an animation that increases the size of the button from the standard size to 300 units wide by 200 units high, and then reverses itself. All you re doing in this exercise is creating a simple animation. Start by placing a standard Button control on the form; it doesn t matter where. Within the Button element, place a Triggers element. Remember that triggers require an action, so within the Triggers section, place a BeginStoryboard element. Inside that, place a Storyboard element, and inside the storyboard, a DoubleAnimation the Height and Width properties are of type double. From there, it s easy to define an animation that targets the Button control and changes the Height. You ll need to define a second DoubleAnimation element to change the Width property of the Button, but this animation is easy; it s nearly identical to the first. You can place both in the same storyboard. The standard size of a default Button control is 23 high 75 wide, which you could find out from the Properties window for the Button, but you don t actually need to know that. If you omit the From attribute in the animation, WPF will use the existing values as the default. The full XAML for this exercise is shown in Example A-57.
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Example A-57. The XAML for Exercise 19-2
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<Window x:Class="Exercise_19_2.Window1" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="Window1" Height="300" Width="300"> <Grid> <Button Height="23" Margin="55,44,0,0" Name="button1" VerticalAlignment="Top" HorizontalAlignment="Left" Width="75" Content="Button"> <Button.Triggers> <EventTrigger RoutedEvent="Button.Loaded"> <BeginStoryboard> <Storyboard> <DoubleAnimation Storyboard.TargetName="button1" Storyboard.TargetProperty="Height" To="200" Duration="0:0:5"
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19: Windows Presentation Foundation
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Example A-57. The XAML for Exercise 19-2 (continued)
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AutoReverse="True" RepeatBehavior="Forever" /> <DoubleAnimation Storyboard.TargetName="button1" Storyboard.TargetProperty="Width" To="300" Duration="0:0:5" AutoReverse="True" RepeatBehavior="Forever" /> </Storyboard> </BeginStoryboard> </EventTrigger> </Button.Triggers> </Button> </Grid> </Window>
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Solution to Exercise 19-3. Create a rectangle, 100 200. Add three buttons to the application: one to rotate the rectangle clockwise, the second to rotate it counterclockwise, and the third to stop the rotation. The point to this exercise is to connect two separate triggers to the same property, specifically, the RotateTransform property of the rectangle. This isn t actually too difficult; you simply have two triggers with the same target. The Stop button also needs to stop both storyboards, but that s not difficult either. The XAML for this exercise is shown in Example A-58.
Example A-58. One solution to Exercise 19-3
<Window x:Class="Exercise_19_3.Window1" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="Window1" Height="311" Width="295"> <Window.Triggers> <EventTrigger RoutedEvent="ButtonBase.Click" SourceName="btnClockwise"> <BeginStoryboard Name="rotateClockwise"> <Storyboard> <DoubleAnimation Storyboard.TargetName="rectRotate" Storyboard.TargetProperty="Angle" From="0.0" To="360.0" Duration="0:0:10" RepeatBehavior="Forever"/> </Storyboard> </BeginStoryboard> </EventTrigger> <EventTrigger RoutedEvent="ButtonBase.Click" SourceName="btnCounterclockwise"> <BeginStoryboard Name="rotateCounterclockwise"> <Storyboard> <DoubleAnimation Storyboard.TargetName="rectRotate"
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Appendix: Answers to Quizzes and Exercises
Example A-58. One solution to Exercise 19-3 (continued)
Storyboard.TargetProperty="Angle" From="360.0" To="0.0" Duration="0:0:10" RepeatBehavior="Forever"/> </Storyboard> </BeginStoryboard> </EventTrigger> <EventTrigger RoutedEvent="ButtonBase.Click" SourceName="btnStop"> <PauseStoryboard BeginStoryboardName="rotateClockwise" /> <PauseStoryboard BeginStoryboardName="rotateCounterclockwise" /> </EventTrigger> </Window.Triggers> <Grid> <Rectangle Margin="110,21,113,0" Name="myRectangle" Stroke="Black" Height="100" VerticalAlignment="Top" RenderTransformOrigin="0.5,0.5" Fill="Cyan"> <Rectangle.RenderTransform> <RotateTransform x:Name="rectRotate" Angle="0.0" /> </Rectangle.RenderTransform> </Rectangle> <Button Height="23" HorizontalAlignment="Left" Margin="20,0,0,106" Name="btnClockwise" VerticalAlignment="Bottom" Width="75">Clockwise</Button> <Button Height="23" HorizontalAlignment="Right" Margin="0,0,26,106" Name="btnCounterclockwise" VerticalAlignment="Bottom" Width="109">Counterclockwise</Button> <Button Height="23" Margin="100,0,103,58" Name="btnStop" VerticalAlignment="Bottom">Stop</Button> </Grid> </Window>
20: ADO.NET and Relational Databases
Quiz Solutions
Solution to Question 20-1. In a relational database, the data is organized into tables, and the queries are defined by the relationships among the tables. Solution to Question 20-2. A primary key is a column that contains values that are unique to the table in which it resides, which allows you to uniquely identify each row. Solution to Question 20-3. A foreign key is a column in a table that is also the primary key in a different table. This allows you to identify the relationship among the tables. Solution to Question 20-4. To retrieve the contents of the Title column in the Books table the appropriate query would be:
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