请问.net连接access数据库的连接字符串

private static void GetConnectionString()
{
if (StrConn == null)
{
StrConn = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + ApplicationInfo.PhysicalApplicationPath + ConfigurationManager.ConnectionStrings["ConnectionString"];
}
}
web.Config
<connectionStrings>
<add name="ConnectionString" connectionString="App_Data/DataBase.mdb"/>
</connectionStrings>