string QjToBj(string str)          {              string QJstr = str;              char[] c = QJstr.ToCharArray();              for (int i = 0; i < c.Length; i++)              {                  byte[] b = System.Text.Encoding.Unicode.GetBytes(c, i, 1);                  if (b.Length == 2)                  {                      if (b[1] == 255)                      {                          b[0] = (byte)(b[0] + 32);                          b[1] = 0;                          c[i] = System.Text.Encoding.Unicode.GetChars(b)[0];                      }                  }              }              string strNew = new string(c);              return strNew;          }