protected void cmdOk_Click( object sender, EventArgs e )
    {
        MailMessage mail = new MailMessage();
        string mailfrom1 = System.Configuration.ConfigurationManager.AppSettings["mailfrom"].ToString();
        string mailto1 = System.Configuration.ConfigurationManager.AppSettings["mailto"].ToString();
        string mailpwd1 = System.Configuration.ConfigurationManager.AppSettings["mailpwd"].ToString();
        mail.To = mailto1;  //接受人的邮箱
        mail.From = mailfrom1;  //你自己的邮箱(注意qq邮箱不行)
        mail.Subject =this.title.Text（前台表单用户输入）;  //邮箱标题
        mail.Body = "正文：" + this.Content.Text（前台表单用户输入）;
        mail.Body += "联系人邮箱：" + this.Email.Text（前台表单用户输入）;
        mail.Body += "联系人姓名：" + this.LinkMan.Text（前台表单用户输入）;
        mail.Fields.Add( "http://schemas.microsoft.com/cdo/configuration/sendusing", "2" );
        mail.Fields.Add( "http://schemas.microsoft.com/cdo/configuration/smtpauthenticate", "1" ); //stmp验证
        mail.Fields.Add( "http://schemas.microsoft.com/cdo/configuration/sendusername", mailfrom1 );
        mail.Fields.Add( "http://schemas.microsoft.com/cdo/configuration/sendpassword", mailpwd1 );

        SmtpMail.SmtpServer = "pop.ym.163.com";  //代理邮件服务器

        SmtpMail.Send( mail );
        this.Page.ClientScript.RegisterStartupScript( this.GetType(), "str", "<script>alert(\"提交成功!\")</script>" );
        bind();
    }

------解决方案--------------------

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引用:
C# code

protected void cmdOk_Click( object sender, EventArgs e )
{
MailMessage mail = new MailMessage();
string mailfrom1 = System.Configuration.ConfigurationManager.A……