protected void Button1_Click1(object sender, EventArgs e)
 {
 string strSQL;
 strSQL = "select mc from TEST001";
 IDataReader dr = dac.DataReaderQuery(strSQL);
 while (dr.Read())
 {
  string mc=dr["mc"].ToString();
  string pym = StrToPinyin.GetChineseSpell(mc);
  if (pym.Length > 6)
  {
  pym = pym.Substring(0, 6);//我这里只去了6位，大家可以看自己爱好而定！
  } 
  string updateSql = "update TEST001 set pym ='" + pym + "' where mc='" + mc + "'";

  dac.update(updateSql);
 }
 dr.Close(); 
 Response.Write("<script>alert('操作成功!');</script>");
 }

StrToPinyin 类的GetChineseSpell方法（取汉字拼音字母）：

public static string GetChineseSpell(string strText)
 {
 if (strText == null || strText.Length == 0)
  return strText;
 System.Text.StringBuilder myStr = new System.Text.StringBuilder();
 foreach (char vChar in strText)
 {
  // 若不是汉字则直接输出 
  if ((int)vChar < 19968 || (int)vChar > 40869)
  {
  myStr.Append(char.ToUpper(vChar));
  }
  else if ((int)vChar >= 19968 && (int)vChar <= 40869)
  {
  // 若字符Unicode编码在编码范围则 查汉字列表进行转换输出 
  foreach (string strList in strChineseCharList)
  {
   if (strList.IndexOf(vChar) > 0)
   {
   myStr.Append(strList[0]);
   break;
   }
  }
  }
 }
 return myStr.ToString();
 }