how to display perticular seleted records in gv?

Question

hi friends,

i am working on air reservation project so i m displaying these data in gridview,,

i took the 2 textbox like source and destination ..

when i selected the data from to source like bangare and destibation part is Goa..
but when i search on click button so all data displaying in gridview which started
from to B like bangalore , bhopla all data is display but i want only bangalore to
goa...

please solve these issues...