how to generate qr code in c# windows application Let s now move on to another very useful layout element called the StackPanel. in C#.NET

Maker QR-Code in C#.NET Let s now move on to another very useful layout element called the StackPanel.

Let s now move on to another very useful layout element called the StackPanel.
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The StackPanel
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A StackPanel is another layout element, and its claim to fame is that it will position content inside of it for you in a stacking manner (horizontally or vertically). This is different from the Grid or Canvas, which rely on
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LAYOUT CONTROLS: INCLUDING THE NEW SILVERLIGHT 4 CONTROLS
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the developer to set the relative or absolute positioning of child objects. Here you ll create a StackPanel and see exactly how it does this:
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1. Select the StackPanel tool from the toolbar. 2. In Row 1 Column 0, draw out a StackPanel. 3. Select the Ellipse tool again from the toolbar. 4. Draw three Ellipses with fixed Heights and Widths and no margins in the newly created
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StackPanel. Here s the resulting XAML that Blend created: <StackPanel HorizontalAlignment="Left" Margin="101,39,0,139" Width="195"> <Ellipse Fill="#FFF4F4F5" Height="65" Stroke="Black" HorizontalAlignment="Left" Width="83"/> <Ellipse Fill="#FFF4F4F5" Height="68" Stroke="Black" Width="100" HorizontalAlignment="Left"/> <Ellipse Fill="#FFF4F4F5" Height="95" Stroke="Black" HorizontalAlignment="Left" Width="104"/> </StackPanel> Notice that the StackPanel arranges your three Ellipses vertically inside of it (see Figure 4-8).
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Figure 4-8. A StackPanel will position its child content horizontally or vertically. You can override the way the StackPanel stacks its content by changing values in the XAML or by changing the Orientation property from Vertical to Horizontal in the Layout section of the Properties panel. Do that now, and you will see that the StackPanel changes from displaying its content from vertically to horizontally, as shown in Figure 4-9.
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Figure 4-9. A StackPanel can position its child content automatically.
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I set each Ellipse to have a HorizontalAlignment of Center. If I hadn t done this, they would have been aligned to the left by default.
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Let s keep going and explore the next layout element in Silverlight, the Border.
The Border
The Border is a very simple layout element that allows you to draw a Stroke around another element and then give it a Background or an actual border. The Border layout element can only have one child element, and that content can be either left, right, top, bottom, or center aligned. These properties can be set manually in the XAML, or in Blend in the Layout section of the Properties panel. Try making a Border element now:
1. Select the Border tool from the toolbar. 2. In Row 0 Column 1, draw a Border. 3. Copy the Ellipse inside your Canvas into the new Border. 4. Change the HorizontalAlignment property in the Layout section of the Properties panel to
see how the child object is affected.
5. Change the VerticalAlignment property in the Layout section of the Properties panel to see
how the child object is affected.
6. Change the Background of the border to a gradient in the Brushes section of the Properties
panel.
7. Use the Brush Transform tool to adjust the gradient to go from top to bottom.
LAYOUT CONTROLS: INCLUDING THE NEW SILVERLIGHT 4 CONTROLS
8. Select the BorderBrush property in the Brushes section of the Properties panel and select a
solid color; I chose green.
9. In the Appearance section of the Properties panel, give the Border a BorderThickness of 3
for the left and right and 1 for the top and bottom. Your Border should look something like that shown in Figure 4-10.
Figure 4-10. The Border content control allows you to draw a stroke and background around an element.
Item Controls
Oftentimes in Silverlight we have collections of data that need to be displayed. For example, we could have a collection of strings (a string of characters such as Hello, World, and Silverlight. To better demonstrate this, I ll show you how to do the following:
Create a new Silverlight project called ListBoxSample. Create sample data in Blend. Populate the sample data. Add a ListBox item control to the project. Bind the ListBox to the sample data.
With that, let s forge ahead and create the new Silverlight project:
1. In Blend, create a new project by clicking File 2. Select Silverlight Application. 3. Name the project ListBoxSample. 4. Click OK.
New Project.
5. Click the Data tab and click the Create Sample Data button, as shown in Figure 4-11.
Figure 4-11. Add sample data to the project.
6. Click New Sample Data. 7. When the New Sample Data dialog box pops up, give the data source a name of
LBDataSource and then click OK, as shown in Figure 4-12.
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Figure 4-12. Name the data source LBDataSource.
8. On the Data tab, click the little arrow next to LBDataSource and then click Collection. 9. Click the Edit sample values button, as shown in Figure 4-13.
Figure 4-13. Edit the sample data.
10. When the Edit Sample Values dialog box appears, change the number of records to 4, as
shown in Figure 4-14.
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