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     c:
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     aspnet_regiis.exe -i
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     pause
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     pause
     ------------------------
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using System;
using System.Web;
using System.Drawing;
using System.Drawing.Imaging;
using System.IO;
public partial class images_code : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
string chkCode = string.Empty;
//ÑÕÉ«ÁÐ±í£¬ÓÃÓÚÑéÖ¤Âë¡¢ÔëÏß¡¢Ôëµã
Color[] color ={ Color.Black, Color.Red, Color.Blue, Color.Green, Color.Orange,Color.Brown, Color.DarkBlue };
//×ÖÌåÁÐ±í£¬ÓÃÓÚÑéÖ¤Âë
string[] font ={ "Times New Roman", "MS Mincho", "Book Antiqua", "Gungsuh","PMingLiU", "Impact" };
//ÑéÖ¤ÂëµÄ×Ö·û¼¯£¬È¥µôÁËһЩÈÝÒ×»ìÏýµÄ×Ö·û
char[] character ={ '2', '3', '4', '5', '6', '8', '9', 'A', 'B', 'C', 'D', 'E','F', 'G', 'H', 'J', 'K', 'L', 'M', 'N', 'P', 'R', 'S', 'T', 'W', 'X', 'Y' };
Random rnd = new Random();
//Éú³ÉÑéÖ¤Âë×Ö·û´®
for (int i = 0; i < 4; i++)
{
chkCode += character[rnd.Next(character.Length)];
}
//±£´æÑéÖ¤ÂëµÄCookie
HttpCookie anycookie = new HttpCookie("validateCookie");
anycookie.Values.Add("ChkCode", chkCode);
HttpContext.Cur ......

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