vs2008编写的一个web简单问题，新手求解
using System;

/// <summary>
///Account 的摘要说明
/// </summary>
public class Account
{
    private string _ID;
    private string _Name;
    private decimal _Balance;
public Account(string id,string name,decimal balance)
{
        this.ID = id;
        this.Name = name;
        this.Balance = balance;

//
//TODO: 在此处添加构造函数逻辑
//
}
    public string ID
    {
        get
        {
            return this._ID;
        }
        set
        {
            this._ID = value;
        }
    }
    public string Name
    {
        get
        {
            return this._Name;
        }
        set
        {
            this._Name = value;
        }
    }
    public decimal Balance
    {
        get
        {
            return this._Balance;
        }
        set
        {
            this._Balance = value;
        }
    }
    ///<summary>
    ///存款方法
    ///</summary>
    public void Deposit(decimal amount)
    {
        if (amount > 0)
        {
            this._Balance += amount;
        }
        else
        {
            throw new Exception("存款金额不能小于或等于0！");
        }
    }
    ///<summary>
    ///取款方法
    ///</summary>
    public void Acquire(decimal amount)
    {