title: how to add displaymenber and value menber to listbox
body: <p>i need to get listbox value menber to be the combobox selected value 
  And for the listbox display menber to be combobox selected text 
  i have tried this </p>
  
  <pre><code>            List&lt;SomeData&gt; data = new List&lt;SomeData&gt;();
          data.Add(new SomeData() { Value = contactIDComboBox1.SelectedValue.ToString(), Text = contactIDComboBox1.SelectedText });
          contactPositionListBox1.DisplayMember = "Text";
          contactPositionListBox1.ValueMember = "Value";
  
  
              if (!contactPositionListBox1.Items.Contains(contactIDComboBox1.SelectedValue))
              {
                  contactPositionListBox1.Items.Add(contactIDComboBox1.SelectedValue);
              }
  </code></pre>