title: how to use combobox as a dropdown list and textbox in asp.net like combobox
body: <p>how to use combobox as a dropdown list and textbox  in asp.net like combobox in windows forms?
  please help 
  when we use ajax toolkit combobox it allows only dropdown list</p>
  
  <p>2)i am getting error in file upload(using ajax toolkit)?</p>