Save images in SQL DB via MVC2

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SQL

MVC

image

When i run my website it show:"The input is not a valid Base-64 string as it contains a non-base 64 character, more than two padding characters, or a non-white space character among the padding characters."
And My View code:

<%@ Page Title="register" Language="C#" MasterPageFile="~/Views/Shared/Site.Master" Inherits="System.Web.Mvc.ViewPage<blog.models.users>" %>
<%@ Import Namespace="blog.Models" %>
 <asp:Content ID="Content2" ContentPlaceHolderID="MainContent" runat="server">
<%using(Html.BeginForm("register","users",FormMethod.Post,new{enctype="multipart/form-data"}))
{%>  <br />
<input type="file" name="upic"/>
<input type="submit" value="upload"/>
<%}%>
   
</asp:Content>

the controller code is :

[AcceptVerbs(HttpVerbs.Post)]
      public ActionResult register([Bind(Exclude = "file")]HttpPostedFileBase file, users u)
      {
              var v = db.users;
              var sna = Request.Form["name"];

              if (v.Count(d => d.name == sna) > 0)
              {

               ckn = 0;

              }

              if (ckn == 1 && sna !="")
              {
                  //如果没错误，返回首页

                  u.uid = SqlHelper.get_ID("users", "uid");
                  u.rdate = DateTime.Now;
                  u.ndate = DateTime.Now;
                  u.pwd = SqlHelper.md5(u.pwd);
                  u.jib = 2;
                  u.psum = 0;
                  file = Request.Files["upic"];
                    Int32 len = file.ContentLength;

                 u.pict = file.ContentType;


                 byte[] photo = new byte[len];

                 file.InputStream.Read(photo, 0, len);

                 u.upic = photo;




                  db.SubmitChanges();

                  db.users.InsertOnSubmit(u);
                  db.SubmitChanges();
              }
}

then, what may the error happen?and how to resolve this problem?
thx for helping me!