Getting error as Member "balance" not found or not visible after argument-dependent lookup in contract Lottery

Question

I am trying one Lottery contract in that I am using one function which give me error.

 function pickAWinner() public restricted {
    require(this.balance >= 10 ether);
    uint index = random() % players.length;
    players[index].transfer(this.balance);
    players = new address[](0);
  }

Getting below error, Below error I am getting other contract also as "Member "balance" not found or not visible after argument-dependent lookup in contract" I think there is issue with 'balance' keyword. however I Unable to fixed it.

  Error:-TypeError: Member "balance" not found or not visible after           
  argument-dependent lookup in contract Lottery. Use 
  "address(this).balance" to access this address member.
    require(this.balance >= 10 ether);
            ^----------^

How can I fixed it?

Answer 1

Change this.balance to address(this).balance.

Answer 2

You need to use

transfer_address.transfer(address(this).balance);

where transfer_address is the address of the account to which you want to transfer all ETH from the current contract