本文將給出通過C#程式設計來實現 忘記密碼 功能的方法和程式碼，大家可以參照本文的思路自己寫出這個功能程式碼……

以下是引用片段：
int result  = user.GetBackPassword(LoginName.Text.Trim(), Question.Text.Trim(),
    Answer.Text.Trim(), Email.Text);

   if (result == 1)
   {
    Message.Text = "您的密碼已傳送，請到郵箱查收";
    //user.ChangePassword(
   }
   else
   {
    Message.Text = "您的輸入資訊有誤！";
   }

public int GetBackPassword(string userName, string question, string answer, string email)
  {
   object m_DBNull = Convert.DBNull;
   //獲得新的隨機密碼
   string newPassword = MakePassword(6);
   //定義儲存過程引數 
   SqlParameter[] para = {
           new SqlParameter("@userName", userName),
           new SqlParameter("@question", question),
           new SqlParameter("@answer", answer),
           new SqlParameter("@newPassword", newPassword),
           new SqlParameter("@result", SqlDbType.Int, 8, ParameterDirection.Output,
           true, 0, 0, "", DataRowVersion.Default, m_DBNull)
          };
   
   //執行儲存過程
   try
   {
    DAL.SQLHelper.ExecuteNonQuery(DAL.SQLHelper.CONN_STRING, CommandType.StoredProcedure,
     "GetBackPwd", para);
   }
   catch
   {
    throw new Exception("郵件無法傳送！");
   }
   //獲得輸出引數的值
   int result = Convert.ToInt32(para[4].Value);
   //如果密碼保護資料填寫正確
   if (result == 1)
   {
    //從Web.config獲取發信人地址、郵件標題、郵件使用者名稱和密碼以及SmtpServer
    string sender = System.Configuration.ConfigurationSettings.AppSettings["mainSender"];
    string title = System.Configuration.ConfigurationSettings.AppSettings["mailTitle"];
    string mailUser =  System.Configuration.ConfigurationSettings.AppSettings["mailUser"];
    string mailPwd = System.Configuration.ConfigurationSettings.AppSettings["mailPwd"];
    string smtpServer = System.Configuration.ConfigurationSettings.AppSettings["mailSmtpServer"];
    //發信
    try
    {
     Mail.CDOsendmail(sender, email, title, "您在eshop的密碼已找回,新密碼為"+newPassword 
      , mailUser, mailPwd, smtpServer);
    }
    catch(Exception ex)
    {
     throw new Exception(ex.Message);
    }
   }

   return result;
  }

//隨機生成密碼
  private static string MakePassword(int pwdLength)
  {
   //宣告要返回的字串
   string tmpstr = "";
   //密碼中包含的字元陣列
   string pwdchars="abcdefghijklmnopqrstuvwxyz0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
   //陣列索引隨機數
   int iRandNum;
   //隨機數生成器
   Random rnd = new Random();
   for(int i=0;i<pwdLength;i++)
   {
    //Random類的Next方法生成一個指定範圍的隨機數
    iRandNum = rnd.Next(pwdchars.Length);
    //tmpstr隨機新增一個字元
    tmpstr += pwdchars[iRandNum];
   }
   return tmpstr;
  }

ALTER  PROCEDURE GetBackPwd
@question nvarchar(50),
@answer nvarchar(50),
@userName nvarchar(50),
@newPassword nvarchar(50),
@result int output
AS
 if exists (SELECT * FROM USERINFO WHERE [email protected] AND [email protected]
    AND [email protected])
 BEGIN
  SET @RESULT = 1
  UPDATE USERINFO
  SET USERPWD = @newPassword
  WHERE userName = @userName
 END
 ELSE
 BEGIN
  SET @RESULT = -1
 END
GO
SET QUOTED_IDENTIFIER OFF 
GO
SET ANSI_NULLS ON 
GO

 <add key="mailUser" value="" />
    <add key="mailPwd" value="" />
    <add key="mailSmtpServer" value="" />
    <add key="mailSender" value="" />
 <add key="mailTitle" value="" />