Forms Data Controls :: How To Make The Repeater Like Group By Col Instead Of Dispaly All Record

after i select data from datatabe and store to datatable finally bind to the repeater to display. but grid is always display what the datatable store there is many duplicate data appear in the repeater. i would like to show specifc col once and hidden other name which appears more than 1.

for example in repeater:

section desc seq no
A NT 1
A BT 2
A KK 3
B PP 1

then A appear more than 1. i would like to hidden A except the first record as belows:

section desc seq no
A NT 1
BT 2
KK 3
B PP 1