IIS调试时出现[OleDbException (0x80004005): 未指定的错误]

在vs2008中调试的时候没问题的
配置到IIS时，一开始可以访问
点击几个链接之后就出现错误
网上找了很多资料 有说数据库没关闭造成的
可是我基本上都关闭了啊 求各位帮忙看看代码
还有说是文件访问权限的问题
数据库是access 加过everyone的权限了
异常详细信息: System.Data.OleDb.OleDbException: 未指定的错误源错误: 
行 23:         {
行 24:             this.con = new OleDbConnection(this.conStr);
行 25:             this.con.Open();
行 26:         }
行 27:         private void close()
 源文件: d:\Backup\代码\kyc\App_Code\DataBase.cs    行: 25 using System;
using System.Data;
using System.Configuration;
using System.Data.OleDb;
using System.Web;
using System.Collections;
using System.Text.RegularExpressions;namespace DataBaseLayer
{
    public class DataBase : System.Web.UI.Page
    {        public OleDbCommand com;
        public OleDbConnection con;
        private string conStr = "";
        private OleDbDataReader dr;
        public DataBase()
        {
            this.conStr = "provider=Microsoft.jet.OLEDB.4.0;data Source=" + HttpContext.Current.Server.MapPath("~/App_Data/kyc.mdb");
        }
        private void open()
        {
            this.con = new OleDbConnection(this.conStr);
            this.con.Open();
        }
        private void close()
        {
            this.con.Close();
            this.con.Dispose();
        }
        public int Insert(string str)
        {
            this.open();
            OleDbCommand cmd = new OleDbCommand(str, this.con);
            return cmd.ExecuteNonQuery();
            this.close();
        }
        public int Delete(string str)
        {
            this.open();
            this.com = new OleDbCommand(str, this.con);
            return com.ExecuteNonQuery();
            this.close();
        }
        public int Update(string str)
        {
            this.open();
            OleDbCommand cmd = new OleDbCommand(str, this.con);
            return cmd.ExecuteNonQuery();
            this.close();
        }
        public string EcuteScalar(string str)
        {
            this.open();
            OleDbCommand cmd = new OleDbCommand(str, this.con);
            return cmd.ExecuteScalar().ToString();
            this.close();
        }
        public OleDbDataReader getDataReader(string str)
        {
            this.open();
            OleDbCommand cmd = new OleDbCommand(str, this.con);
            return cmd.ExecuteReader(CommandBehavior.CloseConnection);
        }
        public OleDbDataAdapter getDataAdapter(string str)
        {
            open();
            OleDbDataAdapter da = new OleDbDataAdapter(str, con);
            return da;
            this.close();
        }
        public DataSet getDataSet(string str)
        {
            DataSet ds = new DataSet();
            try
            {
                open();
                OleDbDataAdapter oda = new OleDbDataAdapter(str, con);
                ds = new DataSet();
                oda.Fill(ds);
            }
            catch
            {
                return null;
            }
            finally
            {
                this.close();
            }
            return ds;
        }
           
}