AnujBank.Account.GetClientId C# (CSharp) Method

        public string GetClientId()
        {
            return ClientId.Id;
        }

 private void Validate(Account newAccount)
 {
     string clientId = newAccount.GetClientId();
      if (accounts.Any(account => account.GetClientId() != clientId))
      {
     throw new ArgumentException("Account from two different clients cannot be added.");
      }
 }