Silverlight RadioButton control in VB.NET

In this article we will learn how to use RadioButton control of Silverlight. I also explained how to rotate image in Silverlight 4.
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In this article we will learn how to use RadioButton control of Silverlight. I also explained how to rotate image in Silverlight 4.

RadioButton Control

RadioButton control are mostly used together in a group but one is selected at a time.

For example:

Drag a image control, five RadioButton control and one Button control from the ToolBox on the Form and select an image from the source property of the Image control. RadioButtons named left, right, up, Down and same. Button named rotate.The form looks like this.

rb1.gif
 

Figure 1.

XAML code

<UserControl x:Class="SilverlightApplication35.MainPage"

    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"

    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"

    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"

    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"

    mc:Ignorable="d"

    d:DesignHeight="300" d:DesignWidth="400">

 

    <Grid x:Name="LayoutRoot" Background="White">

        <RadioButton Content="Left" Height="16" HorizontalAlignment="Left" Margin="12,208,0,0"Name="Rdbtnleft" 

VerticalAlignment="Top" />

        <RadioButton Content="Right" Height="16" HorizontalAlignment="Left" Margin="112,208,0,0"Name="Rdbtnright"

 VerticalAlignment="Top" />

        <RadioButton Content="Up" Height="16" HorizontalAlignment="Left" Margin="206,208,0,0"Name="Rdbtnup"

 VerticalAlignment="Top" />

        <RadioButton Content="Down" Height="16" HorizontalAlignment="Left" Margin="300,208,0,0"Name="Rdbtndown"

 VerticalAlignment="Top" />

        <Image Height="150" HorizontalAlignment="Left" Margin="124,12,0,0" Name="Image1"Stretch="Fill" 

VerticalAlignment="Top" Width="200"Source="/SilverlightApplication35;component/Images/dog-animal.jpg" />

        <Button Content="Rotate" Height="23" HorizontalAlignment="Left" Margin="124,242,0,0"Name="Button1" 

VerticalAlignment="Top" Width="97" />

        <RadioButton Content="Same" Height="16" HorizontalAlignment="Left" Margin="300,245,0,0"Name="Rdbtnsame"

 VerticalAlignment="Top" />

    </Grid>

</UserControl>

 

Rotation of image is being performed by RotateTransform class.

Dim rotate As New RotateTransform()

In click event of Button we are checking radio button's isChecked property. If IsChecked is true for a radio button it means that radio button is selected.

Now double click on the Button named Rotate of the designing form and add the following code.

 

Private Sub Button1_Click(ByVal sender As System.ObjectByVal e AsSystem.Windows.RoutedEventArgsHandles Button1.Click

        Dim rotate As New RotateTransform()

        If Rdbtnleft.IsChecked = True Then             ' Left rotate

            rotate.Angle = 30

            Image1.RenderTransform = rotate

        ElseIf  Rdbtnright.IsChecked = True Then       ' right rotate

            rotate.Angle = 45

            Image1.RenderTransform = rotate

        ElseIf Rdbtnup.IsChecked = True Then           ' up rotate    

            rotate.Angle = 60

            Image1.RenderTransform = rotate                  

 

        ElseIf Rdbtndown.IsChecked = True              'Down rotate

            rotate.Angle = 90

            Image1.RenderTransform = rotate

        Else

            Rdbtnsame.IsChecked = True                   ' for same position

            Image1.RenderTransform = rotate

        End If

    End Sub

Now save and run the application.

rb2.gif
 

Figure 2.

 

Now select Down RadioButton and click on the rotate Button.

rb3.gif
 

Figure 3.

Now to take old position select same RadioButton and click on the rotate Button.

rb4.gif
 

Figure 4.

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