In this article we will learn how to use ComboBox control in WPF using VB.NET.
ComboBox control
ComboBox allows to select only one item from many items. Use Items collection to add the items.
Properties: These are the following properties.
Figure 1.
Items - The collection of items in the list.
Content - Programmatic name of the control.
ForeColor: Color of the text within the control.
ComboBox event
Private Sub ComboBox1_SelectionChanged(ByVal sender As System.Object, ByVal e AsSystem.Windows.Controls.SelectionChangedEventArgs)
Handles ComboBox1.SelectionChanged
End Sub
For example
Drag a ComboBox, Button and TextBox control on the form. when we select the items in the Combobox and click on the button its should be display on the Textbox control.
The form looks like this.
Figure 2.
XAML code:
<Window x:Class="MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow" Height="350" Width="525">
<Grid>
<ComboBox Height="23" HorizontalAlignment="Left" Margin="10,10,0,0"Name="ComboBox1" VerticalAlignment="Top" Width="120" />
<TextBox Height="23" HorizontalAlignment="Left" Margin="180,12,0,0" Name="TextBox1"VerticalAlignment="Top" Width="120" />
<Button Content="Button" Height="23" HorizontalAlignment="Left" Margin="117,72,0,0"Name="Button1" VerticalAlignment="Top" Width="75" />
</Grid>
</Window>
Now double click on the form and add the below code.
Private Sub Window_Loaded(ByVal sender As System.Object, ByVal e AsSystem.Windows.RoutedEventArgs) Handles MyBase.Loaded
For i As Integer = 1950 To DateTime.Now.Year
ComboBox1.Items.Add(i.ToString())
Next
End Sub
Now double click on the button control and add the following code.
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e AsSystem.Windows.RoutedEventArgs) Handles Button1.Click
TextBox1.Text = ComboBox1.SelectedItem
End Sub
Now setting the property Background, Foreground and BorderBrush properties of CheckBox control.
Figure 3.
The form looks like this.
Figure 4.
XAML code
<ComboBox Height="23" HorizontalAlignment="Left" Margin="10,10,0,0" Name="ComboBox1"VerticalAlignment="Top"
Width="120" Background="Blue" Foreground="DarkRed"BorderBrush="DarkGreen" />
Now save and run the application And click the ComboBox than DropDownList items will be display.
Figure 5.
Now select the items from the ComboBox then click on the button the selected items will be display on the TextBox.
Figure 6.