title: How to allow user to type in value in dropdown
body: <p>Forgive me if this is a stupid question but I can't find an answer.</p>
  
  <p>I have an ASP.net web application with a DropDown list with static items in the DropDown. How do I make it so the user can either click the dropdown and select a value OR allow the user to type in a value that is not in the dropdown list?</p>
  
  <p>Thank you</p>