AsyncFileUpload上传后立即显示图片问题

悬赏园豆：30 [已关闭问题]

环境：VS2010+AjaxControlToolKits4

页面上有一个AsyncFileUpload和一个Image服务器控件，当点击AsyncFileUpload的上传按钮成功上传图片后，Image中的图像没有改变。代码如下：

<asp:Image ID="ImgPhoto" runat="server" />
 <asp:AsyncFileUpload 
OnUploadedComplete="AsyncFileUpload1_UploadedComplete" 
runat="server" ID="AsyncFileUpload1" Width="400px" />

    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            LoadSex();
            if (Request.QueryString["id"] == null)
            {
                TxtID.Text = string.Empty;
                BtnResetPassword.Visible = false;
                TxtName.Text = string.Empty;
                CmbSex.SelectedIndex = 0;
                ImgPhoto.ImageUrl = "~/Images/DefaultPhoto.jpg";
                TxtIDCode.Text = string.Empty;
                TxtMobile.Text = string.Empty;
                TxtEmail.Text = string.Empty;
                TxtOther.Text = string.Empty;
                TxtEntryTime.Text = DateTime.Today.ToString("yyyy-MM-dd");
                TxtDimissionTime.Text = string.Empty;
                TxtRemark.Text = string.Empty;
                BtnSubmit.Text = "创建新用户";
            }
            else
            {
                string userid = Server.UrlDecode(Request.QueryString["id"]);
                User user = FPS.Common.User.GetItemByID(userid);
                if (user == default(User))
                {
                    Response.Write("对不起，您要修改的用户不存在！");
                    Response.End();
                }
                else
                {
                    if (user.ID == Request.Cookies["UserID"].Value || user.ID.ToLower() == "admin")
                    {
                        Response.Write("对不起，您不能修改自己或管理员用户！");
                        Response.End();
                    }
                    TxtID.Text = user.ID;
                    BtnResetPassword.Visible = true;
                    TxtName.Text = user.Name;
                    CmbSex.SelectedValue = ((int)user.Sex).ToString();
                    ImgPhoto.ImageUrl = "~/Core/LoadPhoto.aspx?userid=" + Server.UrlEncode(user.ID);
                    TxtIDCode.Text = user.IDCode;
                    TxtMobile.Text = user.Mobile;
                    TxtEmail.Text = user.Email;
                    TxtOther.Text = user.Other;
                    TxtEntryTime.Text = user.EntryTime.ToString("yyyy-MM-dd");
                    if (user.DimissionTime.ToString("yyyy-MM-dd") == DateTime.MaxValue.ToString("yyyy-MM-dd"))
                        TxtDimissionTime.Text = string.Empty;
                    else
                        TxtDimissionTime.Text = user.DimissionTime.ToString("yyyy-MM-dd");
                    TxtRemark.Text = user.Remark;
                    BtnSubmit.Text = "保存修改";
                }
            }
        }
    }

    protected void AsyncFileUpload1_UploadedComplete(object sender, AjaxControlToolkit.AsyncFileUploadEventArgs e)
    {
        string imgpath = MapPath("~/Images/TempPhoto/") + Request.UserHostAddress + "_" + DateTime.Now.ToString("yyyyMMddhhmmss") + Path.GetExtension(e.filename);
        string imgurl = imgpath.Replace(MapPath("~/Images/TempPhoto/"), "../Images/TempPhoto/");
        AsyncFileUpload1.SaveAs(imgpath);
        ScriptManager.RegisterClientScriptBlock(AsyncFileUpload1, AsyncFileUpload1.GetType(), "img", "top.document.getElementById('" + ImgPhoto.ClientID + "').src='" + imgurl + "';", true);
    }