using System;
using System.Data;
using System.Configuration;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
using System.Text;
using System.Net.Mail;
using System.Net;

namespace Web.Common
{
    ///<summary>
    /// 找回密码类
    ///</summary>
    public class MyEmail
    {
        #region 找回密码
        ///<summary>
        /// 功能：用户找回密码
        ///</summary>
        ///<param name="ToEmail">目的地地址</param>
        ///<param name="memberid">会员ID</param>
        ///<returns></returns>
        public static bool SendMail(string ToEmail,string memberid)
        {
            string Email = "[email protected]";
            string password = "abcd";
            Encoding EnCode = Encoding.UTF8;
            System.Net.Mail.MailMessage Message = new System.Net.Mail.MailMessage();
            Message.From = new MailAddress(Email, "新郑网购会员管理中心", EnCode);
            Message.To.Add(new MailAddress(ToEmail, "尊敬的用户", EnCode));
            Message.Subject = "新郑网购网找回密码";
            Message.SubjectEncoding = EnCode;
            //CC为抄送，即发给用户的同时，再发送给Email
            //Message.CC.Add(new MailAddress(Email,"房产巴巴网"));
            StringBuilder MailContent = new StringBuilder();
            MailContent.Append("尊敬的用户：<br/>");
            MailContent.Append("&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;您好！你于");
            MailContent.Append(DateTime.Now.ToLongTimeString());
            MailContent.Append("通过<a href='#'>新郑网购</a>管理中心审请找回密码。");
            MailContent.Append("<br/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;为了安全起见，请用户点击以下链接重设个人密码：");
            string url = "http://www.hnjcg.com/getPass.aspx?memberid=" + memberid + "&email=" + ToEmail;
            MailContent.Append("<br/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a href='" + url + "'>" + url + "</a>");
            Message.Body = MailContent.ToString();
            Message.BodyEncoding = EnCode;
            Message.IsBodyHtml = true;

            try
            {
                SmtpClient smtp = new SmtpClient("smtp.163.com", 25);
                smtp.Credentials = new NetworkCredential(Email, password);
                smtp.DeliveryMethod = SmtpDeliveryMethod.Network;
                smtp.Send(Message);
            }
            catch (Exception)
            {
                return false;
            }
            finally
            {
                Message.Dispose();
            }
            return true;
        }
        #endregion
    }
}      接收邮箱返回数据并重置密码：

    string  memeberid = "";//用来接收找回密码时返回的email地址,与会员编号
        protected void Page_Load(object sender, EventArgs e)
        {
            if (Request.QueryString["email"] != null)
            {
                email = Request.QueryString["email"].ToString();
            }
            if (Request.QueryString["memberid"] != null)
            {
                memeberid = Request.QueryString["memberid"].ToString();
                modelMember = bllMember.GetModel(long.Parse(memeberid));
                modelMember.PassWord = TianDao.Common.DEncrypt.DESEncrypt.Encrypt("123456");
                if (modelMember.Email == email)//验证邮箱地址是否为用户注册时候的邮箱地址 
                {
                    bllMember.Update(modelMember);
                    Response.Write("<script>alert('您的密码已重置，默认密码为123456,请尽快修改密码！');window.location.href='../login.aspx';</script>");
                }
            }
            if (!IsPostBack)
            {
               
            }
        }

 /// <summary>
    /// 隐藏部分邮箱名
    /// </summary>
    /// <param name="source"></param>
    /// <returns></returns>
    public static string HideEmail(string email)
    {
        string[] em = email.Split(new char[] { '@' }, StringSplitOptions.RemoveEmptyEntries);
        string em2 = em[0].ToString();
        string em3 = "";
        string em4 = "";
        if (em2.Length > 3)
        {

            for (int i = 0; i < em2.Length - 3; i++)
            {
                em4 += "*";
            }
            em3 = em2.Substring(0, 3) + em4 + "@" + em[1].ToString();
        }
        else
        {
            em3 = "***" + "@" + em[1].ToString();
        }

        return em3;

    }
    /// <summary>
    /// 验证邮箱是否合法
    /// </summary>
    /// <param name="source"></param>
    /// <returns></returns>
    public static bool IsEmail(string source)
    {
        return Regex.IsMatch(source, @"^[A-Za-z0-9](([_.-]?[a-zA-Z0-9]+)*)@([A-Za-z0-9]+)(([.-]?[a-zA-Z0-9]+)*).([A-Za-z]{2,})$", RegexOptions.IgnoreCase);
    }

使用正则表达式类(Regex Class)

如果你没有使用服务器端的控件(意味着你不能使用验证控件),或者你需要其它的输入字段源而非表单字段(比如查询字串参数和cookies),那么你可以使用正则表达式类(Regex class).

使用正则表达式类

加入使用using前缀的语句导入System.Text.RegularExpressions命名空间. 
确认正则表达式包含"^"和"$"(字串开始处,字串结束处). 
调用Regex类的IsMatch方法,下面是代码示例. 
 

// Instance method:
Regex reg = new Regex(@"^[a-zA-Z'.\s]{1,40}$");
Response.Write(reg.IsMatch(txtName.Text));

// Static method:
if (!Regex.IsMatch(txtName.Text,@"^[a-zA-Z'.\s]{1,40}$")) 
{
  // Name does not match expression
}

 

如果你不能把经常使用的正则表达式缓存起来,你应该使用IsMatch静态方法来改进性能防止不必要的对象创建过程.