OracleParameter数组重复使用的有关问题

OracleParameter数组重复使用的问题
AdoHelper adoHelper = AdoHelper.CreateHelper(StarTech.News.Common.AppConfig.DBInstance);
  StringBuilder strSql = new StringBuilder();
  strSql.Append("update T_NEWS_SEND set ROOTDEPARTID=:ROOTDEPARTID,ROOTDEPARTNAME=:ROOTDEPARTNAME,");
  strSql.Append("DEPARTID=:DEPARTID,DEPARTNAME=:DEPARTNAME,USERID=:USERID,USERNAME=:USERNAME,CREATEDATE=:CREATEDATE");
  strSql.Append(" where NEWSID=:NEWSID and SENDORGID=:SENDORGID and ROOTDEPARTID IS NULL");
  string newsID = Request.QueryString["recordID"].Trim();
  string rootDepartID = this.RootDepartId;
  string rootDepartName = this.RootDepartName;
  string departID = this.DepartId;
  string departName = this.DepartName;
  string userID = this.UserId;
  string userName = this.MemberName;
  DateTime createTime = DateTime.Now;

  OracleParameter[] parameters = new OracleParameter[]
  {
  new OracleParameter(":SENDORGID",OracleType.VarChar,40),
  new OracleParameter(":NEWSID",OracleType.VarChar,40),
  new OracleParameter(":ROOTDEPARTID",OracleType.VarChar,40),
  new OracleParameter(":ROOTDEPARTNAME",OracleType.VarChar,40),
  new OracleParameter(":DEPARTID",OracleType.VarChar,40),
  new OracleParameter(":DEPARTNAME",OracleType.VarChar,40),
  new OracleParameter(":USERID",OracleType.VarChar,40),
  new OracleParameter(":USERNAME",OracleType.VarChar,40),
  new OracleParameter(":CREATEDATE",OracleType.DateTime)
  };
  parameters[1].Value = newsID;
  parameters[2].Value = rootDepartID;
  parameters[3].Value = RootDepartName;
  parameters[4].Value = departID;
  parameters[5].Value = departName;
  parameters[6].Value = userID;
  parameters[7].Value = userName;
  parameters[8].Value = createTime;

  //如果包含送达到人的公告
  parameters[0].Value = this.UserId;
  adoHelper.ExecuteSqlNonQuery(strSql.ToString(), parameters);

  //如果包含送达到部门的公告
  parameters[0].Value = this.DepartId;
  adoHelper.ExecuteSqlNonQuery(strSql.ToString(), parameters);

  //如果包含送达到单位的公告
  parameters[0].Value = this.RootDepartId;
  adoHelper.ExecuteSqlNonQuery(strSql.ToString(), parameters);

为什么parameters不能被得复使用？？Microsoft是怎么样考虑的？？

[解决办法]
参数有点像指针，可分为输入、输出和输入输出，NEW了一个实例，多个会话在修改参数数据，不合理的
[解决办法]
用深拷贝

List<OracleParameter> list1 = new List<OracleParameter>();
foreach (var p in par)
{
list1.Add((OracleParameter)((ICloneable)p).Clone());
}