asp.Image控件引用窗体读出的图像文件

引用页面控件：
<asp:Image ID="imgPhoto" ImageUrl = "~/Cntrol/MemPhotoWF.aspx" runat="server" Height="73px" Width="55px" />

被引用页面：
//读取页面头像绑定
        protected string ImageS(object PBface)
        {
            if (PBface == null)
            {
                return AppDomain.CurrentDomain.BaseDirectory + "Images\\MemPhotos\\" + "photo.gif";
            }
            else
            {
                try
                {
                    if (File.Exists(AppDomain.CurrentDomain.BaseDirectory + "Images\\MemPhotos\\" + PBface))
                    {
                        return AppDomain.CurrentDomain.BaseDirectory + "Images\\MemPhotos\\" + PBface;
                    }
                    else
                    {
                        return AppDomain.CurrentDomain.BaseDirectory + "Images\\MemPhotos\\" + "photo.gif";
                    }
                }
                catch
                {
                    return AppDomain.CurrentDomain.BaseDirectory + "Images\\MemPhotos\\" + "photo.gif";
                }
            }
        }
        /// <summary>
        /// 数字转换为位图图像
        /// </summary>
        /// <param name="vnum"></param>
        public void ValidateCode(string  imgPhotos)
        {
            Response.ClearContent();
            Response.ContentType = "image/Bmp"; //浏览器显示图片，否则浏览器将下载提示保存该图
            Response.WriteFile(imgPhotos);
            Response.End();
        }