On demand combo and asp.net

how to develop a ondeman combo which behave like when user click on arrow button of the combo then 10 records as content will load in the combo and show and when user scroll down the combo then again 10 record will show and display. at the bottom end of the combo the will pagination system like next prev. please advise me t开发者_JAVA百科o how to develop this type of combo in asp.net....thanks