private void GetFromFontButton_Click(object sender, EventArgs e)
        {
            string fontName = FontNameComboBox2.Text;
            float  fontSize = 22.0f;

            if (float.TryParse(FontSizeTextBox2.Text, NumberStyles.Number, CultureInfo.InvariantCulture, out fontSize))
            {
            }
            else
            {
                return;
            }
            bool fontBold = FontBoldCheckbox2.Checked;

            using (var font = new Font(fontName, fontSize, fontBold ? FontStyle.Bold : FontStyle.Regular))
            {
                float kanjiWidth = CharacterWidthCache.MeasureString("漢", font);
                KanjiWidthTextBox.Text = kanjiWidth.FloatToString();
            }
        }