各位老师请帮我解释一下大概思路！

5.2.5,添加货币转换功能代码

Html控件
<body>
    <form runat="server">
    <div>
    Convert:
    <input type="text" id="us" runat="server" />
     u.s. dollars to Euros
    <br /><br />
    <input type="submit" value="ok" id="convert" runat="server" onserverclick="convert_serverclick" />
     <br /><br />
     <div style="font-weight:bold" id="result" runat="server"></div>
    </div>
    </form>
</body>
后台C#代码
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

public partial class _currencyconverter : System.Web.UI.Page
{
    protected void convert_serverclick(object sender, EventArgs e)
    {
        decimal usamount = decimal.Parse(us.Value);
        decimal euroamount = usamount * 0.85M;
        result.InnerText = usamount.ToString() + "u.s.dollars=";
        result.InnerText += euroamount.ToString() + "euros,";
    }
}

--------------------编程问答-------------------- --------------------编程问答-------------------- decimal usamount = decimal.Parse(us.Value);类型转换 decimal类型
decimal euroamount = usamount * 0.85M;
result.InnerText = usamount.ToString() + "u.s.dollars=";/赋值
result.InnerText += euroamount.ToString() + "euros,";

拼接InnerText 输出。

补充：.NET技术 ,  ASP.NET