WPF C#

    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="WPF" Height="100" Width="300">
    
        
            
            
            
            
            
        
        
    


//File:Window.xaml.cs
using System;
using System.Windows;
using System.Windows.Controls;
namespace WpfApplication1
{
    public partial class Window1 : Window
    {
        public Window1()
        {
            InitializeComponent();
        }
        private void Button_Click(object sender, RoutedEventArgs e)
        {
            ComboBoxItem item = comboBox.SelectedItem as ComboBoxItem;
            if (item != null)
            {
                MessageBox.Show("Current item: " + item.Content, Title);
            }
            else if (!String.IsNullOrEmpty(comboBox.Text))
            {
                MessageBox.Show("Text entered: " + comboBox.Text, Title);
            }
        }
        private void ComboBox_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            if (!IsInitialized) return;
            ComboBoxItem item = comboBox.SelectedItem as ComboBoxItem;
            if (item != null)
            {
                MessageBox.Show("Selected item: " + item.Content, Title);
            }
        }
        private void ComboBoxItem_Selected(object sender,RoutedEventArgs e)
        {
            if (!IsInitialized) return;
            ComboBoxItem item = e.OriginalSource as ComboBoxItem;
            if (item != null)
            {
                MessageBox.Show(item.Content + " was selected.", Title);
            }
        }
    }
}