Combobox Binding

Main.cs

using System.Windows.Forms;

namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
            comboBox1.DisplayMember = "Value";
            comboBox1.ValueMember = "Key";
            var dic = new Dictionary<int, string>();
            dic.Add(1, "hello");
            dic.Add(2, "goodbye");
            comboBox1.DataSource = new BindingSource(dic, null);
        }

        private void comboBox1_SelectedValueChanged(object sender, EventArgs e)
        {
            if (comboBox1.SelectedValue != null)
                MessageBox.Show(comboBox1.SelectedValue.ToString());
        }
    }
}