table1 name id dept abc 1 cse
abc 2 it
table2 name gender code abc male a1
abc female a2
table3 code sender
a1 xy
a1 yz
a2 pq
a2 qr
gridview name gender sender abc male,female
all 3 colums shd be in dropdownlist.if name selected correspondin valus shd be in gender colum.if male selected correspondin values shd be in sender colum in dropdownlist.