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I was build my own project ,but i was forget to save it before,so all changes not recorded,it makes me to build again my project from beginning,
Unfortunately, the only answer is backup, backup, backup.
Backups is a worthless activity done by any serious programmer in hope it will never be useful, but 1 day the backup is invaluable, and for you today is the day.
Backup - Wikipedia[
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Software versioning - Wikipedia[
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In French, there is a saying: "Il faut être pris pour être appris" which translate as something like "you have to be taken to be learned".