how to set alert based on sql column

Question

 i have a simple application in windows form and c# . user set some follow up date in system those date are store in sql database column datatyle is datetime. now in fature user lofin the application he/she will see a aleart form on based on those flooow up date, now i explain with example  today user set a follow up date as 12-Sep=2015,now when user login on 12th sep an aleart form show all the record which are having same date.