Asp.net sendMail

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using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
using System.Web.Util;
namespace localhost
{
/// <summary>
/// Sendmail 的摘要说明。
/// </summary>
public class Sendmail : System.Web.UI.Page
{
   protected System.Web.UI.WebControls.RequiredFieldValidator RequiredFieldValidatorInputMailTo;
   protected System.Web.UI.WebControls.RegularExpressionValidator RegularExpressionValidatorInputMailTo;
   protected System.Web.UI.WebControls.RequiredFieldValidator RequiredFieldValidatorInputMailFrom;
   protected System.Web.UI.WebControls.RequiredFieldValidator RequiredFieldValidatorinputMailPwd;
   protected System.Web.UI.WebControls.RegularExpressionValidator RegularExpressionValidatorInputMailFrom;
   protected System.Web.UI.WebControls.RequiredFieldValidator RequiredFieldValidatorInputMailSubject;
  
   protected System.Web.UI.WebControls.TextBox textBoxMailBody;
   protected System.Web.UI.WebControls.RequiredFieldValidator RequiredFieldValidatorTextBoxMailBody;
   protected System.Web.UI.WebControls.Label labelSendMailResult;
   protected System.Web.UI.HtmlControls.HtmlInputText inputMailTo;
   protected System.Web.UI.HtmlControls.HtmlInputText inputMailFrom;
   protected System.Web.UI.HtmlControls.HtmlInputText inputMailSubject;
   protected System.Web.UI.HtmlControls.HtmlInputFile inputMailAttachment;
   protected System.Web.UI.HtmlControls.HtmlInputButton buttonSendMail;
   protected System.Web.UI.HtmlControls.HtmlInputText inputMailPwd;

   private void Page_Load(object sender, System.EventArgs e)
   {
    // 在此处放置用户代码以初始化页面
   }
   public void SendMail (Object Obj, EventArgs E)
   {
    labelSendMailResult.Text = "";
    if (Page.IsValid)
    {
     System.Web.Mail.MailMessage mailObj = new System.Web.Mail.MailMessage();
     // 设置email的'from'和'to'的地址
     mailObj.From = inputMailFrom.Value;
     mailObj.To = inputMailTo.Value;
     mailObj.Subject = inputMailSubject.Value;
     mailObj.Body = textBoxMailBody.Text;
     // 可选: 使用html格式的Email
     mailObj.BodyFormat = System.Web.Mail.MailFormat.Html;
   
     // 可选: 对邮件进行加密
     // mailObj.BodyEncoding = MailFormat.Base64;
     // 可选: 设置邮件的优先级别为高
     mailObj.Priority = System.Web.Mail.MailPriority.High;
     // 可选: 附件
     if (inputMailAttachment.PostedFile.ContentLength > 0)
     {
      // 注意这里我们创建了一个MailAttachment对象来附加一个文件到email。
      mailObj.Attachments.Add(new System.Web.Mail.MailAttachment(inputMailAttachment.PostedFile.FileName));
     }
     // 使用SmtpMail对象来发送邮件。
     System.Web.Mail.SmtpMail.SmtpServer = "smtp.163.com";
     //设置验证密码
     mailObj.Fields.Add("http://schemas.microsoft.com/cdo/configuration/smtpauthenticate", "1"); //basic authentication
     mailObj.Fields.Add("http://schemas.microsoft.com/cdo/configuration/sendusername", this.inputMailFrom.Value.ToString().Trim()); //set your username here
     mailObj.Fields.Add("http://schemas.microsoft.com/cdo/configuration/sendpassword",this.inputMailPwd.Value.ToString().Trim()); //set your password here
     System.Web.Mail.SmtpMail.Send(mailObj);
     labelSendMailResult.Text = "邮件发送成功 From: " + inputMailFrom.Value + "; To: " + inputMailTo.Value;
     if (inputMailAttachment.PostedFile.ContentLength > 0)
     {
      labelSendMailResult.Text += "<br>该邮件包含附件: " + inputMailAttachment.PostedFile.FileName + ", 附件大小为: " + (inputMailAttachment.PostedFile.ContentLength / 1024).ToString() + " K Byte(s)";
     }
    }
   }
   #region Web 窗体设计器生成的代码
   override protected void OnInit(EventArgs e)
   {
    //
    // CODEGEN: 该调用是 ASP.NET Web 窗体设计器所必需的。
    //
    InitializeComponent();
    base.OnInit(e);
   }
  
   /// <summary>
   /// 设计器支持所需的方法 - 不要使用代码编辑器修改
   /// 此方法的内容。
   /// </summary>
   private void InitializeComponent()
   {   
    this.Load += new System.EventHandler(this.Page_Load);
   }
   #endregion
}
}