key-value in listbox

//set listbox
from https://stackoverflow.com/questions/8634066/cannot-do-key-value-in-listbox-in-c-sharp

var choices = new Dictionary<string, string>(); 
choices["A"] = "Arthur"; 
choices["F"] = "Ford"; 
choices["T"] = "Trillian"; 
choices["Z"] = "Zaphod"; 
listBox1.DataSource = new BindingSource(choices, null); 
listBox1.DisplayMember = "Value"; 
listBox1.ValueMember = "Key"; 

//get item key value
from https://stackoverflow.com/questions/507354/how-do-i-get-at-the-listbox-items-key-in-c-sharp-winforms-app

            KeyValuePair<string, string> kvp = (KeyValuePair<string, string>)listBoxEmp.SelectedItem;
            string empID = kvp.Key;


//Remove ListBox item
                listBoxEmp.DataSource = null;
                listBoxEmp.Items.Clear();