display time left dynamically

hi,

i have 3 labels as

lblstarttime
lblendtime
lbltimeleft


lets assume that -
lblstarttime displays 15:24:24
lblendtime displays 15:44:24

now how do i code so that lbltimeleft shows the time left ie the difference between lblstarttime and lblendtime. i mean lbltimeleft should change with every sec and show the current status.

thanks.

Put your time calculation and time display difference in a Timer which fires at an internal you establish.