C#将XML中的数据存储到ACCESS数据库

using (OleDbConnection cn = new OleDbConnection(@"Provider=Microsoft.Jet.OleDb.4.0;Data Source=msg.mdb"))
            {
                cn.Open();
                using (OleDbCommand cmd = new OleDbCommand())
                {
                    cmd.Connection = cn;
                    cmd.CommandType = CommandType.Text;

                    XmlDocument xml = new XmlDocument(); //装载XML数据
                    xml.InnerXml = sbuf.ToString();

                    XmlNodeList xn = xml.GetElementsByTagName("message");

                    foreach (XmlElement xe in xn)
                    {
                        cmd.CommandText = string.Format(
                            "INSERT INTO inbox([msgid],[teacher],[content],[msgdate],[userid]) VALUES ('{0}', '{1}', '{2}', '{3}','{4}')",
                            xe.ChildNodes[0].InnerText.Trim(),
                            xe.ChildNodes[1].InnerText.Trim(),
                            xe.ChildNodes[2].InnerText.Trim(),
                            xe.ChildNodes[3].InnerText.Trim(),
                            username
                        );

                        cmd.ExecuteNonQuery();
                    }
                }
                cn.Close();
            }