Access 通用数据访问类(asp.net 2.0 c#)

仿照以前收集的一个经典sql server数据访问类，稍做修改。
using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Data.OleDb;

/// <summary>
/// DataAccess 的摘要说明
/// </summary>
public class DataAccess
{
    protected static OleDbConnection conn = new OleDbConnection();
    protected static OleDbCommand comm = new OleDbCommand();
 public DataAccess()
 {
  //init
 }
    private static void openConnection()
    {
        if (conn.State == ConnectionState.Closed)
        {
            conn.ConnectionString = @"Provider=Microsoft.Jet.OleDb.4.0;Data Source="+ConfigurationManager.AppSettings["myconn"];//web.config文件里设定。
            comm.Connection = conn;
            try
            {
                conn.Open();
            }
            catch (Exception e)
            { throw new Exception(e.Message); }

        }
      
    }//打开数据库
 
    private static void closeConnection()
    {
        if (conn.State == ConnectionState.Open)
        {
            conn.Close();
            conn.Dispose();
            comm.Dispose();
        }
    }//关闭数据库

    public static void excuteSql(string sqlstr)
    {
        try

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