StringWriterメモ(よく使うから
using (StreamWriter streamWriter = new StreamWriter(filepath, false, Encoding.GetEncoding("Shift_JIS");)) { streamWriter.Write(ごにょごにょ); }
using (StreamWriter streamWriter = new StreamWriter(filepath, false, Encoding.GetEncoding("Shift_JIS");)) { streamWriter.Write(ごにょごにょ); }