access数据库 配置路径

<configuration>
<system.web>
<compilation debug="true" targetFramework="4.5" />
<httpRuntime targetFramework="4.5" />
</system.web>
<appSettings>
<add key="SQLConnString" value="provider=microsoft.jet.oledb.4.0;data source="/>
<add key="connectionAccess" value="~/DataBase/zwbestdb.mdb"/>
</appSettings>
</configuration>

//*********************************

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Data;
using System.Data.OleDb;
using System.Configuration;
using System.Web;
using System.Collections;

public static readonly string connectionString = System.Configuration.ConfigurationManager.AppSettings["SQLConnString"].ToString() + System.Web.HttpContext.Current.Server.MapPath(ConfigurationManager.AppSettings["connectionAccess"]) + ";";