You have to convert the int into a LoadRunner parameter and then do paramaterization, like this:
int SeatNo=35;
lr_save_int( SeatNo, "SeatNoParameter");
web_submit_data("default.aspx",
"Action=http://lazarus/flightnet/default.aspx",
"Method=POST",
"TargetFrame=",
"RecContentType=text/html",
"Referer=http://lazarus/flightnet/",
"Snapshot=t7.inf",
"Mode=HTML",
ITEMDATA,
"Name=SeatNumber", "Value={SeatNoParameter}", ENDITEM,
"Name=SeatLoc", "Value=", ENDITEM,
LAST );
Or you could just do this without the initial declaration:
lr_save_int( 35, "SeatNoParameter");
web_submit_data("default.aspx",
"Action=http://lazarus/flightnet/default.aspx",
"Method=POST",
"TargetFrame=",
"RecContentType=text/html",
"Referer=http://lazarus/flightnet/",
"Snapshot=t7.inf",
"Mode=HTML",
ITEMDATA,
"Name=SeatNumber", "Value={SeatNoParameter}", ENDITEM,
"Name=SeatLoc", "Value=", ENDITEM,
LAST );
Or you could just make a parameter file and do it that way. Depends on where you're getting the data from.