ASP.NET(C#)通用数据库类

 
Web.Config文件代码：(配置文件)
<?xml version="1.0" encoding="utf-8"?>
<configuration>
  <appSettings>
    <add key="Myconn" value="Access"/>
  </appSettings>
  <connectionStrings>
    <add name="oleconn" providerName="System.Data.OleDb" connectionString="Provider=Microsoft.Jet.OleDb.4.0;Data 
Source=|DataDirectory|92dotnet.mdb"/>
    <add name="sqlconn" providerName="System.Data.Sql" connectionString="server=
(local);database=92dotnet;uid=sa;pwd=gmajlhx"/>
  </connectionStrings>
</configuration>
Mydataone.cs文件代码：(基类)
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;
using System.Data.SqlClient;
namespace Mydotnet     
{
    public class Mydataone   //数据层基类
    {
        public Mydataone()
        {
            
        }
        /// <summary>
        /// 返回一个Connection对象 
        /// </summary>
        /// <param name="Connstring">Myconn的值,判断Connection对象属于哪种类型</param>
        /// <return