csharp:datagridview enter Half Width and Full Width characters

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/// <summary>       /// 全角       /// </summary>       /// <param name="unicodeString"></param>       /// <returns></returns>       public static string FullWidthConvertor(string unicodeString)       {             StringBuilder sb = new StringBuilder(256);           LCMapString(LOCALE_SYSTEM_DEFAULT, LCMAP_FULLWIDTH, unicodeString, -1, sb, sb.Capacity);           return sb.ToString();         }       /// <summary>       /// 半角       /// </summary>       /// <param name="unicodeString"></param>       /// <returns></returns>       public static string HalfWidthConvertor(string unicodeString)       {             StringBuilder sb = new StringBuilder(256);           LCMapString(LOCALE_SYSTEM_DEFAULT, LCMAP_HALFWIDTH, unicodeString, -1, sb, sb.Capacity);           return sb.ToString();           }       private const uint LCMAP_FULLWIDTH = 0x00800000;       private const uint LOCALE_SYSTEM_DEFAULT = 0x0800;       private const uint LCMAP_HALFWIDTH = 0x00400000;         [DllImport("kernel32.dll", CharSet = CharSet.Unicode)]       public static extern int LCMapString(uint Locale, uint dwMapFlags, string lpSrcStr, int cchSrc, StringBuilder lpDestStr, int cchDest);       /// <summary>       /// DataGridView单位格输入全角转半角       /// </summary>       /// <param name="sender"></param>       /// <param name="e"></param>       private void dridViewRowNumberNo_EditingControlShowing(object sender, DataGridViewEditingControlShowingEventArgs e)       {           GridViewRowNumberNo dt = sender as GridViewRowNumberNo;           //获取列序号           int columnIndex = dt.CurrentCell.ColumnIndex;           //单位格转化成文本框           TextBox tb = e.Control as TextBox;           //委托单位格KeyPress事务           tb.KeyPress += new KeyPressEventHandler(geovindu_KeyPress);       }       /// <summary>       /// 单位格KeyPress事务       /// </summary>       /// <param name="sender"></param>       /// <param name="e"></param>       private void geovindu_KeyPress(object sender, KeyPressEventArgs e)       {           Control ctl = sender as Control;           if (ctl == null)               return;           if (ctl.ImeMode != ImeMode.Hangul)               ctl.ImeMode = ImeMode.Hangul;           //全角转半角           if (e.KeyChar >= 65296 && e.KeyChar <= 65305)           {               e.KeyChar -= Convert.ToChar(65248);           }         }