ShopingNet/Pages/Background/YZM.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.IO;

public partial class YZM : System.Web.UI.Page
{

    protected void Page_Load(object sender, EventArgs e)
    {
        Bitmap bit =createImage(createCode());
        MemoryStream ms = new MemoryStream();
        bit.Save(ms, ImageFormat.Jpeg);
        Response.ClearContent();
        Response.ContentType = "bit/jpeg";
        Response.BinaryWrite(ms.ToArray());
    }


        Random random = new Random();
        //
        public string createCode()
        {
            string codes = string.Empty;
            char code = ' ';
            for (int i = 0; i < 4; i++)
            {
                int x = random.Next();
                if (x % 2 == 0)
                {
                    code = (char)('A' + x % 26);
                }
                else
                {
                    code = (char)('0' + x % 10);
                }
                codes += code;

            }

        Session["imgyzm"] = codes;
            return codes;
        }

        public Bitmap createImage(string codes)
        {
            Bitmap bit = new Bitmap(codes.Length * 15, 23);

            Graphics gp = Graphics.FromImage(bit);
            gp.Clear(Color.White);