How to get currently selected ComboBox item in WPF using VB.NET

Introduction
 
Here in this article I am explaining that how you can get currently selected items in a comboBox on button click. The implementation needs one ComboBox and a Button control. Then you add items in ComboBox , a little code and when you click on Button a Message will display with the Currently selected item of the ComboBox.

Getting Started

• Simply create a new WPF application. 
• Drag a ComboBox and a Button Control on Main Window. Your window will look like below.
  
  
   
• Your MainWindow.xaml page will look like below.
  
  <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="300" Width="277">
      <StackPanel>
          <ComboBox Name="comboBox" IsEditable="True" Margin="5"
  SelectionChanged="ComboBox_SelectionChanged">
              <ComboBoxItem Content="ComboBox Item 1" Selected="ComboBoxItem_Selected" />
              <ComboBoxItem Content="ComboBox Item 2" Selected="ComboBoxItem_Selected" />
              <ComboBoxItem Content="ComboBox Item 3" Selected="ComboBoxItem_Selected" IsSelected="True"/>
              <ComboBoxItem Content="ComboBox Item 4" Selected="ComboBoxItem_Selected" />
              <ComboBoxItem Content="ComboBox Item 5" Selected="ComboBoxItem_Selected" />
          </ComboBox>
          <Button Content="Show Selected Item" Margin="5" Width="100" Click="Button_Click" Name="btnSelect"
  />
      </StackPanel>
  </Window>
   
• Then add the below code in code behind file.
  
     Private Sub btnSelect_Click(sender As Object, e As RoutedEventArgs)
          Dim listitem As ComboBoxItem = TryCast(comboBox.SelectedItem, ComboBoxItem)
          If listitem IsNot Nothing Then
              MessageBox.Show("present Current items in list: " & Convert.ToString(listitem.Content),
              Title)
          ElseIf Not [String].IsNullOrEmpty(comboBox.Text) Then
              MessageBox.Show("Enterde Text: " + comboBox.Text, Title)
          End If
      End Sub
      Private Sub ComboBox_SelectionChanged(sender As Object, e As SelectionChangedEventArgs)
          If Not IsInitialized Then
              Return
          End If
           Dim listitem As ComboBoxItem = TryCast(comboBox.SelectedItem, ComboBoxItem)
          If listitem IsNot Nothing Then
              MessageBox.Show("Selected item: " & Convert.ToString(listitem.Content), Title)        End If
      End Sub
      Private Sub ComboBoxItem_Selected(sender As Object, e As RoutedEventArgs)
          If Not IsInitialized Then
              Return
          End If
          Dim listitem As ComboBoxItem = TryCast(e.OriginalSource, ComboBoxItem)
          If listitem IsNot Nothing Then
              MessageBox.Show(Convert.ToString(listitem.Content) & " was selected.", Title)
          End If
      End Sub
   
• Now run your application.

Output:-