Need help with cinema system

Hi and thanks in advance I am having trouble with a cinema system I am
creating in VB.NET. I have a form called frmSales which has three
datagridviews on it which are linked to a Cinema.mdb database using SQL. The
first datagridview (Film) displays the FilmNumber(Unique Key) and FullTitle
of the Film, the second datagridview (Date) displays the days the film is on
for and the third datagridview (Session) displays SessionNo(Unique Key),
Time, Cinema and SeatNumbers. I have two buttons on this form called Sales
and the other called Return.

What I need help with is the code for the buttons so that when the user has
selected the three datagridviews and depending on whether Cinema 1 or Cinema
2 was selected in datagridview Session then when either the Sales or Return
button is pressed they will be taken to the corresponding Cinema form (In
this case either frmCinema1 or frmCinema2).

Any help would be appreciated.

Cheers,
Kryt0n1t3