case "doc": ContentType = "application/msword"; bre

case "doc":                     ContentType = "application/msword";                     break;                 case "pdf":                     ContentType = "application/pdf";                     break;                 case "jpg":                 case "jpeg":                     ContentType = "image/jpeg";                     break;                 case "gif":                     ContentType = "image/gif";                     break;                          case "zip":                     ContentType = "application/zip";                     break;                 case "txt":                     ContentType = "text/plain";                     break;                 case "htm":                 case "html":                     ContentType = "text/html";                     break;                             case "xls":                     ContentType = "application/vnd.ms-excel";                     break;                 case "ppt":                     ContentType = "application/vnd.ms-powerpoint";                     break;                 default:                     ContentType = "application/octet-stream";                     break;