>On Save Button, I use FLUSH FORCE command as
>

>select avlbook
>seek thisform.text1.value
>if !found()
>	append blank
>	replace date with thisform.text14.value
>	replace gate_no with thisform.text1.value
>endif
>
>select avlbook
>go top
>append blank
>delete
>pack
>flush force
>

>
>Is it true way or I should change codes

This code is wrong. You do not need to append a blank record and then delete that. Just use the following:

select avlbook

if !seek( thisform.text1.value )

	append blank
	replace ;
          date    with thisform.text14.value, ;
	  gate_no with thisform.text1.value

endif

pack   && this is not a good idea

use    &&  close the table

flush force