Did you check your balance from an online block explorer.
Try to check your balance from blockchain.info.
yes, I did check it. The balance is zero now

There is nothing to do. I didn't use Electron Cash so I don't have any information but my friend used it without any problems.
I think there is a virus on your computer which stole your coins.
so, you think it's not an electron cash problem, but my computer has been compromised?