再问连接问题

我用ASP.net （ C#） 连接oracle数据库，结果出现如下错误，哪位能给讲讲为啥？异常详细信息: System.ArgumentException: Keyword not supported: 'driver'.源错误: 
行 15：  {
行 16：  OracleConnection Conn = new OracleConnection();
行 17：  Conn.ConnectionString = "Driver={Microsoft ODBC for Oracle};server="+Server+";UID="+UID+";PWD=" + PWD;
行 18：  Conn.Open();
行 19：  OracleDataAdapter Adapter = new OracleDataAdapter("Select HPHM,HPZL,ZT from BlackList",Conn);
 源文件: e:\c#\blacklist\blacklistset.cs    行: 17 堆栈跟踪: 
[ArgumentException: Keyword not supported: 'driver'.]
   System.Data.OracleClient.DBConnectionString.ParseInternal(Char[] connectionString, UdlSupport checkForUdl, NameValuePair& keychain)
   System.Data.OracleClient.DBConnectionString..ctor(String connectionString, UdlSupport checkForUdl)
   System.Data.OracleClient.OracleConnectionString..ctor(String connectionString)
   System.Data.OracleClient.OracleConnectionString.ParseString(String connectionString)
   System.Data.OracleClient.OracleConnection.set_ConnectionString(String value)
   BlackList.BlackListSet..ctor(String Server, String UID, String PWD) in e:\c#\blacklist\blacklistset.cs:17
   BlackList.WebForm1.Page_Load(Object sender, EventArgs e) in e:\c#\blacklist\webform1.aspx.cs:34
   System.Web.UI.Control.OnLoad(EventArgs e)
   System.Web.UI.Control.LoadRecursive()
   System.Web.UI.Page.ProcessRequestMain()