Easy.COMMON/GetValidateImg.cs

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Web;
using System.IO;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Drawing;
using System.Drawing.Imaging;
namespace Easy.COMMON
{
    public class GetValidateImg : Page
    {
        // Methods
        private void CreateImage(string checkCode)
        {
            int i;
            int iwidth = checkCode.Length * 0x10;
            Bitmap image = new Bitmap(iwidth, 20);
            Graphics g = Graphics.FromImage(image);
            g.Clear(Color.White);
            Color[] c = new Color[] { Color.Black, Color.Red, Color.DarkBlue, Color.Green, Color.Chocolate, Color.Brown, Color.DarkCyan, Color.Purple };
            string[] font = new string[] { "Verdana", "Microsoft Sans Serif", "Comic Sans MS", "Arial" };
            Random ramdon = new Random();
            for (i = 0; i < 50; i++)
            {
                int x = ramdon.Next(image.Width);
                int y = ramdon.Next(image.Height);
                g.DrawRectangle(new Pen(Color.LightGray, 0f), x, y, 1, 1);
            }
            for (i = 0; i < checkCode.Length; i++)
            {
                int cindex = ramdon.Next(7);
                int findex = ramdon.Next(4);
                Font f = new Font(font[findex], 10f, FontStyle.Bold);
                Brush b = new SolidBrush(c[cindex]);
                g.DrawString(checkCode.Substring(i, 1), f, b, (float)(1 + (i * 14)), 1f);
            }
            g.DrawRectangle(new Pen(Color.Black, 0f), 0, 0, image.Width - 1, image.Height - 1);
            MemoryStream ms = new MemoryStream();
            image.Save(ms, ImageFormat.Jpeg);
            base.Response.ClearContent();
            base.Response.ContentType = "image/Jpeg";
            base.Response.BinaryWrite(ms.ToArray());
            g.Dispose();
            image.Dispose();
        }

        private void Page_Load(object sender, EventArgs e)
        {
            char[] chars = "23456789ABbCDdEeFGgHhJKkMmNnPpQqRSsTtUuVvWwXxYyZz".ToCharArray();
            Random random = new Random();
            string validateCode = string.Empty;
            for (int i = 0; i < 4; i++)
            {
                validateCode = validateCode + chars[random.Next(0, chars.Length)].ToString();
            }
            this.Session["validate_code"] = validateCode;
            this.CreateImage(validateCode);