FileInfo file = new FileInfo(Server.MapPath(System.Configuration.ConfigurationSettings.AppSettings["dbFile"].ToString()));
            if((file.Attributes&FileAttributes.ReadOnly)!=0)
            {
                file.Attributes = FileAttributes.Normal;
            }
            FileSecurity fs = file.GetAccessControl();
           
            fs.AddAccessRule(new FileSystemAccessRule("EveryOne", FileSystemRights.FullControl, AccessControlType.Allow));
            file.SetAccessControl(fs);