private void ClearFolder(string fldName, string fld)
        {
            var t    = new Thread(Task_clearFolder);
            var args = new PossibleClearArgs
            {
                FldName    = fldName,
                FolderName = fld
            };

            t.Start(args);
        }
        private void ClearFilesOfType(string fldName, string folderName, string fileExtensions, SearchOption searchOption)
        {
            var t    = new Thread(Task_clearFilesOfType);
            var args = new PossibleClearArgs
            {
                FldName        = fldName,
                FolderName     = folderName,
                FileExtensions = fileExtensions,
                SearchOption   = searchOption
            };

            t.Start(args);
        }