private void buttonReference_Click(object sender, System.EventArgs e)
{
OpenFileDialog dlg = new OpenFileDialog();
dlg.Filter = "wave file(*.wav)|*.wav";
dlg.Title = "リファレンスファイルの選択";
if(dlg.ShowDialog() != DialogResult.OK) return;
this.textReferenceName.Text = dlg.FileName;
}