public void EmptyAppData()
        {
            string        appData       = _context.Server.MapPath("~/App_Data");
            DirectoryInfo directoryInfo = new DirectoryInfo(appData);

            foreach (FileInfo file in directoryInfo.GetFiles())
            {
                file.Delete();
            }
            foreach (DirectoryInfo dir in directoryInfo.GetDirectories())
            {
                dir.Delete(true);
            }
            SystemConfigurationProvider.ClearCache();
            ConfigurationProvider.ClearCache();
        }