4-2.aspx.cs

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

public partial class _4_2 : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        //下载于www.51aspx.com
    }
    protected void Button1_Click(object sender, EventArgs e)
    {
        rectangle rectangle1 = new rectangle();
        rectangle1.length = int.Parse(TextBox1.Text);
        rectangle1.width = int.Parse(TextBox2.Text);
        rectangle1.rectangle_area();
        Label3.Text = ("长方形的面积是：" + rectangle1.area);
    }
    protected void Button2_Click(object sender, EventArgs e)
    {
        rectangle rectangle2 = new rectangle();
        rectangle2.length = int.Parse(TextBox1.Text);
        rectangle2.width = int.Parse(TextBox2.Text);
        rectangle2.rectangle_perimeter();
        Label3.Text = ("长方形的周长是：" + rectangle2.perimeter);
    }
}
class rectangle { 
     public double length;
     public double width;
     public double area;
     public double perimeter;
     public void rectangle_area() {
         area = length * width;
     }
     public void rectangle_perimeter() {
         perimeter = 2 * (length + width);
     }
}