asp.net MVC如何实现上传功能

<% using (Html.BeginForm("up","Home",FormMethod.Post,new{enctype="multipart/form-data"})) {%>
<input type="file" name="upfile" />
<input type ="submit" name ="upload" value ="上传" />
<%} %>

Homecontroller中的代码
[code]
[AcceptVerbs(HttpVerbs.Post)]
public ActionResult up(HttpPostedFileBase upfile)
{
if (upfile != null)
{
if (upfile.ContentLength > 0)
{
upfile.SaveAs("d://7.jpg");
}
}
return RedirectToAction("Index");
}

<form action="<%=Url.Action("upload2") %>" enctype="multipart/form-data" method="post">
<input name="up1" type="file" /><input type="submit" />
</form>

public ActionResult upload2(HttpPostedFileBase up1)
{
up1.SaveAs("d://8.jpg");
return Content(up1.FileName);
}