Image.aspx.cs

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using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

using System.Drawing;
using System.Drawing.Imaging;
using System.Drawing.Drawing2D;

namespace ValidationCode
{

    public partial class Image : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            Random rd = new Random(); //创建随机数对象       

            int Results = 0;
            int Num1 = rd.Next(10); ;
            int Num2 = rd.Next(10); ;
            string Expressions = "";

            int F=(rd.Next(3)+1);
            switch (F)
            {
                case 1:
                    Results = Num1 + Num2;
                    Expressions = Num1 + "＋ " + Num2 + "＝ " + Results;
                    break;
                case 2:
                    Results = Num1 - Num2;
                    Expressions = Num1 + "－ " + Num2 + "＝ " + Results;
                    break;
                case 3:
                    Results = Num1 * Num2;
                    Expressions = Num1 + "×" + Num2 + "＝ " + Results;
                    break;
                //case 4:
                //    if (Num2 > 0)
                //    {
                //        Results = Convert.ToInt16(Num1 / Num2);
                //        Expressions = Num1 + "整除 " + Num2 + "＝ " + Results;
                //    }
                //    else
                //    {
                //        Results = Num1;
                //        Expressions = Num1 + "整除 1＝ " + Results;
                //    }
                //    break;
            }

            //验证码值存放到Session中用来比较
            Session["Code"] = Results.ToString();