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2.ÔÚ×öºÃÒ³ÃæºóË«»÷Button¿Ø¼þ(¼´"="),дÈëÈçÏ´úÂë:
 
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data.SqlClient;
 
public partial class _Default : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
 
    }
    protected void Button1_Click(object sender, EventArgs e)
    {
        double a = Convert.ToDouble(TextBox1.Text);//¶¨ÒåÒ»¸ö±äÁ¿a£¬°ÑTextBox1ÖеÄÖµ¸³¸øËü
        double b = Convert.ToDouble(TextBox2.Text);//¶¨ÒåÒ»¸ö±äÁ¿b£¬°ÑTextBox2ÖеÄÖµ¸³¸øËü
        /*¶¨ÒåµÄ±äÁ¿Îª¸¡µãÐÍ*/
        if(DropDownList1.SelectedValue == "+" )//»ñȡѡÔñµÄÔËËã·û£¬È·¶¨ÔËËãÀàÐÍ
        {
            TextBox3.Text = Convert.ToString(a + b);
        }
        else if (DropDownList1.SelectedValue == "-")
        {
            TextBox3.Text = Convert.ToString(a - b);
        }
        else if (DropDownList1.SelectedValue == "*")
        {
            TextBox3.Text = Convert.ToString(a * b);
        }
        else if (DropDownList1.SelectedValue == "/")
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using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Data.OleDb;
using System.Data.SqlClient;
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