/// <summary> /// Attempts to edit specified BankAccount in the BankAccount collection. /// Throws an ArgumentException if the account can not be found. /// </summary> /// <param name="ba">BankAccount to be edited</param> /// <param name="surname">New surname</param> /// <param name="accountNumber">New accoutnumber</param> internal void EditBankAccount(BankAccount ba, string surname, int accountNumber) { if (ba != null) { ba.EditBankAccount(surname, accountNumber); } else { throw new ArgumentNullException("Bank account to edit not present."); } }