BackGround Job running endless

Hi,

If i run my program in foreground it is working fine...if i submit in background it is running without end..if i say cancel then it is showing me as Finished and giving me the correct output also..

iam running from F8 >PROGRAM >Execute in Background...Actually i copied this program from some other program and done some enchancement...old programming is working fine..but new program running endless...

Could any body tell me the reason..