protected void btnUpload_Click(object sender, EventArgs e)        {            Boolean FileOK = false;            Boolean FileSaved = false;            String accountName = SPContext.Current.Web.CurrentUser.LoginName;            string fileNameWithoutExtension = GetFileNameFromAccountName(accountName);            String FileExtension = string.Empty;            SPWeb web = SPContext.Current.Web;            SPSecurity.RunWithElevatedPrivileges(delegate()            {                    using (SPSite currentSite = new SPSite(web.Site.Url))                    {                                     using (SPWeb currentWeb = currentSite.OpenWeb())                        {                            if (Upload.HasFile)                            {                                    FileExtension = Path.GetExtension(Upload.FileName.ToString()).ToLower();                                    String[] allowedExtensions = { ".png", ".jpeg", ".jpg", ".gif" };                                    for (int i = 0; i < allowedExtensions.Length; i++)                                    {                                            if (FileExtension == allowedExtensions[i])                                            {                                                    FileOK = true;                                                    break;                                            }                                    }                                }                            if (FileOK)                            {                                    try                                    {                                            currentWeb.AllowUnsafeUpdates = true;                                            SPSecurity.CatchAccessDeniedException = false;                                            SPList listePictureUpload = currentWeb.GetList(SPUtility.ConcatUrls(currentWeb.Url, "User Photos"));                                            SPFile itemPictureUpload = currentWeb.Files.Add(listePictureUpload.RootFolder.Url + "/" + Upload.FileName.Remove(Upload.FileName.Length -                                 FileExtension.Length) + fileNameWithoutExtension + FileExtension, Upload.FileBytes, true);                                            //SPFile itemPictureUpload = listePictureUpload.RootFolder.Files.Add(Upload.FileName.Remove(Upload.FileName.Length - FileExtension.Length) +                                 fileNameWithoutExtension + FileExtension, Upload.FileBytes, true);                                            currentWeb.AllowUnsafeUpdates = false;                                    }                             }                      }                }             });}