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//"Application.StartupPath(현재 실행된 폼의 경로) + \\삭제하고싶은 원하는 폴더명" 을 dir로 선언
 DirectoryInfo dir = new DirectoryInfo(Application.StartupPath + "\\삭제하고싶은 원하는 폴더명");
 
// ture값을 줘서 폴더내에 파일이 있어도 삭제 ture값을 안주면 폴더내에 파일이 있을경우 삭제가안됨
dir.Delete(true);
cs