barcode generator project in vb.net <Label Target="{Binding ElementName=firstName}">_First Name:</Label> in Font

Creation Data Matrix in Font <Label Target="{Binding ElementName=firstName}">_First Name:</Label>

<Label Target="{Binding ElementName=firstName}">_First Name:</Label>
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Bind the Label to firstName. F is the accelerator key.
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The following markup creates two text Labels and binds each one to a TextBox (which I ll cover in 10). The first Label is bound to a TextBox named firstName, and the second is bound to a TextBox named lastName. The F and L keys are the respective accelerator keys for the TextBoxes. Figure 67 shows the window. <StackPanel > <Label Target="{Binding ElementName=firstName}">_First Name:</Label> <TextBox Name="firstName"></TextBox> <Label Target="{Binding ElementName=lastName}">_Last Name:</Label> <TextBox Name="lastName"></TextBox> </StackPanel>
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Figure 6-7. The Labels in the window are bound to the TextBoxes.
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CHAPTER 6 CONTENT AND CONTROLS
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The Button Control
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As I m sure you re aware, the Button is a visual object that a user can click to tell the program to take some action. When a button is clicked, the system raises an event associated with the button. To handle the event, you must have an event handler in the code-behind. The event handler performs whatever actions are represented by the button click. You can create the Button in either markup or the code-behind but the event handler must be in the code-behind. Since a Button is a ContentControl, it can have any content.
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Figure 6-8 shows the markup and code-behind for a simple button. When the button is clicked, the code-behind launches a message box. I ll cover the MessageBox class later in this chapter.
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Figure 6-8. A Button with an instantiation in XAML and the Click event handler in the code-behind
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CHAPTER 6 CONTENT AND CONTROLS
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The CheckBox and RadioButton Controls
A normal Button doesn t retain the information about whether or not it has been clicked before or whether any other Button has been clicked. The CheckBox and RadioButton controls, however, are special forms of buttons that maintain state. Every time the user clicks a CheckBox, it toggles between the checked and unchecked states by setting or unsetting its IsChecked property. It displays its state visually by showing a small box, either with or without a check mark. The RadioButton is like a CheckBox, except that it is designed to be a member of a group of RadioButtons. The group has the constraint that only one of the RadioButtons can be selected at any time. When a RadioButton is selected, any other RadioButton that might have been in the IsChecked state becomes unchecked. From the code-behind, you can check whether a particular CheckBox or RadioButton is selected by checking its IsChecked property. If a CheckBox or RadioButton has its IsThreeState property set to true, then the value of the IsChecked property can be true, false, or null.
Figure 6-9 shows a window with two CheckBoxes and three RadioButtons. The markup for the window is shown after the figure. I gave the controls Names so they could be manipulated from the codebehind. I gave them Margins so that they would look a little nicer, separated a bit from each other and from the window edges.
Figure 6-9. CheckBoxes are independent, but only one RadioButton from a group can be selected. <StackPanel> <CheckBox <CheckBox <RadioButton <RadioButton <RadioButton </StackPanel>
Name="cb1" Name="cb2" Name="rb1" Name="rb2" Name="rb3"
Margin="5,10,0,0">Option 1</CheckBox> Margin="5,0,0,0">Option 2</CheckBox> Margin="5,10,0,0">One of Three</RadioButton> Margin="5,0,0,0">Two of Three</RadioButton> Margin="5,0,0,0">Three of Three</RadioButton>
CHAPTER 6 CONTENT AND CONTROLS
Grouping RadioButtons
Since RadioButtons are meant to be used in groups, it s important to know how to group them. By default, all RadioButtons in a parent element belong to the same group. You can explicitly create RadioButton groups by setting the GroupName properties of the buttons. For each RadioButton, you can set its GroupName property to a string. All the buttons with the same GroupName string belong to the same group.
For example, the following markup creates six RadioButtons, in three groups. The first two RadioButtons are, by default, grouped by the StackPanel, which contains them. The second two comprise a group called Group1, and the last two comprise a group called Group2. <StackPanel> <RadioButton Margin="5,0,5,0">Default 1</RadioButton> <RadioButton Margin="5,0">Default 2</RadioButton> <RadioButton GroupName="Group1" Margin="5,7,5,0">Group1-1</RadioButton> <RadioButton GroupName="Group1" Margin="5,0">Group1-2</RadioButton>
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