用.net自带的发邮件，怎样修改发件人名称？解决方法

用.net自带的发邮件，怎样修改发件人名称？？
我写了下面的代码，想用QQ邮箱发邮件，可以成功发邮件了
但是发过去时，发件人显示 "736230838 ",感觉很难看
请问怎么让别人收到的邮件的发件人写我的名字？？

public   void   MySendMail(string   mailto,string   mailsubject,string   mailbody)
{
MailMessage   mm   =   new   MailMessage();
mm.To   =   mailto;
mm.From   =   "736230838@qq.com ";
mm.Subject   =   mailsubject;
mm.Body   =   mailbody;
mm.BodyFormat   =   MailFormat.Html;    
mm.Fields.Add( "http://schemas.microsoft.com/cdo/configuration/smtpauthenticate ",       "1 ");                  
mm.Fields.Add( "http://schemas.microsoft.com/cdo/configuration/sendusername ",       "736230838 ");              
mm.Fields.Add( "http://schemas.microsoft.com/cdo/configuration/sendpassword ",       "123456 ");      
SmtpMail.SmtpServer   =   "smtp.qq.com ";
SmtpMail.Send(mm);
}


[解决办法]
你用的是1.1么？
2.0中可以这样
msg.From = new MailAddress( "nhibernate@qq.com ", "nhibernate now ");

[解决办法]
赋值是字符串的话可以用
mm.From = "\ "nhibernate now\ " <nhibernate@qq.com> ";
mm.Sender = " <nhibernate@qq.com> ";