asp.netc#Access通用数据访问类

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="+System.Web.HttpContext.Current.Server.MapPath(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
  &nbs