Controller Code for 2 Reports in 1 Button

hello, i need help here.

I have 2 Reports:  Report1, Report2

in Button Click of Open Report, i want to Open the Report depending on the SalesTable Qty.

If (SalesTable.Qty = 0)

{

Show Report 1

}

elseif (SalesTableQty > 0)

{

Show Report 2

}

i need code for the controller code for this. can someone help me? thanks.

NOTE:

I already have a Controller class that gets SalesTable.SalesId to be the Parameter in my Report.

I only need the code on where to put the Condition in Opening the 2 Reports.

please help, thanks.