This is what I made changes

if ((select max(ID) from table1)=(select max(ID) from table2)) exec xp_cmdshell `sqlcmd -E -S "DBNAME\INSTANCE1" -h-1 -Q ` (

echo executed commandshell

start "" "D:\firstpgm\bin\Debug\firstpgm.exe"

goto end

)

:end

echo END

Not sure if this is correct way of invoking.