关于XPOk开发方面的问题,谢谢请教

public class Member:XPObject
{
public string strName;
public int iAge;
public Member(string userName,string password,string database,string server,int connectTimeout)
{
Session sconn=new Session();
sconn.AutoCreateOption=AutoCreateOption.None;
sconn.ConnectionString=String.Format("user id={0};password={1};initial catalog={2};data source={3};Connect Timeout={4}", userName, password, database, server, connectTimeout);
sconn.Connect();
}
}
这样为何不能与数据库链接上呀??