話不多說 先上效果圖：
功能：
1.每一個更新按鈕對應著所更新的書籍定價數量，並將結果輸出至消費總金額處
2.提交對應著所有書籍對應價格數量的總和，同樣輸出至總金額處
3.重置既重新整理頁面
實列：
1.整體是居中的，效果圖存在位置偏差
2.數量和消費總金額的預設值是0，如果將0刪除會出現報錯，所以請小心
OK 上程式碼
.aspx

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

namespace login
{
    public partial class WebForm1 : System.Web.UI.Page
    {
        protected void num1(object sender, EventArgs e)
        {
            double str = Convert.ToDouble(TextBox.Text);
            double a = 49.00;
            TextBox4.Text = Convert.ToString(str * a);
        }
        protected void num2(object sender, EventArgs e)
        {
            double str1 = Convert.ToDouble(TextBox1.Text);
            double a = 49.00;
            TextBox4.Text = Convert.ToString(str1 * a);
        }
        protected void num3(object sender, EventArgs e)
        {
            double str2 = Convert.ToDouble(TextBox2.Text);
            double c = 53.00;
            TextBox4.Text = Convert.ToString(str2 * c);
        }
        protected void num4(object sender, EventArgs e)
        {
            double str3 = Convert.ToDouble(TextBox3.Text);
            double d = 45.00;
            TextBox4.Text = Convert.ToString(str3 * d);
        }
        protected void num(object sender, EventArgs e)
        {
            double str = Convert.ToDouble(TextBox.Text);
            double str1 = Convert.ToDouble(TextBox1.Text);
            double str2 = Convert.ToDouble(TextBox2.Text);
            double str3 = Convert.ToDouble(TextBox3.Text);
            double a = 49.00;
            double c = 53.00;
            double d = 45.00;
            TextBox4.Text = Convert.ToString(str3 * d+ str2 * c+ str1 * a+ str * a);
        }
        protected void f(object sender, EventArgs e)
        {
            Response.Redirect(Request.Url.ToString());
        }
        protected void Page_Load(object sender, EventArgs e)
        {

        }
    }
}
 

.aspx.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

namespace login
{
    public partial class WebForm1 : System.Web.UI.Page
    {
        protected void num1(object sender, EventArgs e)
        {
            
 
double str = Convert.ToDouble(TextBox.Text);
            double a = 49.00;
            TextBox4.Text = Convert.ToString(str * a);
        }
        protected void num2(object sender, EventArgs e)
        {
            double str1 = Convert.ToDouble(TextBox1.Text);
            double a = 49.00;
            TextBox4.Text 
 
= Convert.ToString(str1 * a);
        }
        protected void num3(object sender, EventArgs e)
        {
            double str2 = Convert.ToDouble(TextBox2.Text);
            double c = 53.00;
            TextBox4.Text = Convert.ToString(str2 * c);
        }
        protected void num4(object sender, EventArgs e)
        {
            double str3 = Convert.ToDouble(TextBox3.Text);
            double d = 45.00;
            TextBox4.Text = Convert.ToString(str3 * d);
        }
        protected void num(object sender, EventArgs e)
        {
            double str = Convert.ToDouble(TextBox.Text);
            double str1 = Convert.ToDouble(TextBox1.Text);
            double str2 = Convert.ToDouble(TextBox2.Text);
            double str3 = Convert.ToDouble(TextBox3.Text);
            double a = 49.00;
            double c = 53.00;
            double d = 45.00;
            TextBox4.Text = Convert.ToString(str3 * d+ str2 * c+ str1 * a+ str * a);
        }
        protected void f(object sender, EventArgs e)
        {
            Response.Redirect(Request.Url.ToString());
        }
        protected void Page_Load(object sender, EventArgs e)
        {

        }
    }
}

其實還有更優的方法的
歡迎指點
其實加入購物車事件也寫好的了 不過太爛了 就不出來丟人了
有沒有人 說兩句