clase

.cs

public class Account : IAccount  
    {  
        double _balance;  
  
        public double CurrentBallance { get { return _balance; } }  
          
        public double Deposit(double amount)  
        {  
            if (amount > 0)  
            {  
                _balance += amount;  
                return _balance;  
            }  
            else  
            {  
                throw new ArgumentException("Invalid Deposit Amount!");  
            }  
                 }  
public double Withdraw(double amount)  
        {  
            if (amount > 0 && _balance >= amount)  
            {  
                _balance -= amount;  
            }  
            else  
            {  
                throw new ArgumentException("No balance to Withdraw!");  
            }  
  
            return _balance;  
      }  
}