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ASP.NETÑéÖ¤Âë(C#)

* Copyright all(c) 2005 ZhongFeng, http://blog.csdn.net/SW515 */
 public class ValidateCode : System.Web.UI.Page
 {
  private void Page_Load(object sender, System.EventArgs e)
  {
   this.CreateCheckCodeImage(GenerateCheckCode());
  }
  #region Web ´°ÌåÉè¼ÆÆ÷Éú³ÉµÄ´úÂë
  override protected void OnInit(EventArgs e)
  {
   //
   // CODEGEN: ¸Ãµ÷ÓÃÊÇ ASP.NET Web ´°ÌåÉè¼ÆÆ÷Ëù±ØÐèµÄ¡£
   //
   InitializeComponent();
   base.OnInit(e);
  }
  
  /// <summary>
  /// Éè¼ÆÆ÷Ö§³ÖËùÐèµÄ·½·¨ - ²»ÒªÊ¹ÓôúÂë±à¼­Æ÷ÐÞ¸Ä
  /// ´Ë·½·¨µÄÄÚÈÝ¡£
  /// </summary>
  private void InitializeComponent()
  {   
   this.Load += new System.EventHandler(this.Page_Load);
  }
  #endregion
  private string GenerateCheckCode()
  {
   int number;
   char code;
   string checkCode = String.Empty;
   System.Random random = new Random();
   for(int i=0; i<5; i++)
   {
    number = random.Next();
    if(number % 2 == 0)
     code = (char)('0' + (char)(number % 10));
    else
     code = (char)('A' + (char)(number % 26));
    checkCode += code.ToString();
   }
   Response.Cookies.Add(new HttpCookie("CheckCode", checkCode));
   return checkCode;
  }
  private void CreateCheckCodeImage(string checkCode)
  {
   if(checkCode == null || checkCode.Trim() == String.Empty)
    return;
   System.Drawing.Bitmap


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