I am receiving a "Access to path is denied message" in regard to the path I am trying to allow users to upload files to. I have set NetworkService to have both Modify and Write privileges on the userfiles directory. In IIS 7, the website is using DefaultAppPool whose identity is NetworkService and it is targeting .NET 4.0 framework. At this point I have even tried using Everyone with all permissions and still I receive the error. Any tips?

Code for control:

if (FileUploader.HasFile)
        {
            try
            {
                string filename = System.IO.Path.GetFileName(FileUploader.FileName);
                FileUploader.SaveAs(Server.MapPath("//Data/Sites/1/userfiles"));               
            }
            catch (Exception ex)
            {
                label_UploadStatus.Text = "Upload status: The file could not be uploaded. <br />The following error occurred: " + ex.Message;
            }
        }