ASP.NET - Cadena de Conexión con Access

using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

using System.Data.OleDb;

using System.Data;

using System.Configuration;

/// <summary>

/// Clase Conexión a la Base de Datos SIIFE PLUS

/// </summary>

namespace siife_plus

{

    public class clsConexion

    {

        protected OleDbDataAdapter AdaptadorDatos;

        protected OleDbDataReader reader;

        protected DataSet data;

        protected DataTable tablebd;

        protected OleDbConnection oconexion = new OleDbConnection();

        public void conectar(string tabla)

        {

            string  strConexion = new OleDbConnection("Provider = Microsoft.ACE.OLEDB.12.0; C:\SIIFE PLUS\siifePlus.accdb);

            oconexion.ConnectionString = strConexion;

            oconexion.Open();

            AdaptadorDatos = new OleDbDataAdapter("select *from" + tabla, oconexion);

            OleDbCommandBuilder ejecutacomandos = new OleDbCommandBuilder(AdaptadorDatos);

            Data = new DataSet();

            AdaptadorDatos.Fill(Data, tabla);

            oconexion.Close();

        }

        public DataSet Data

        {

            set { data = value; }

            get { return data; }

        }

        public OleDbDataReader DataReader

        {

            set { reader = value; }

            get { return reader; }

        }

    }

}

using NPoco;

using System.Data.SqlClient;

namespace ConexionBD

{

    public class DBContext

    {

        public static Database GetInstance()

        {

            return new Database(@"Data Source=(LocalDB)\MSSQLLocalDB;AttachDbFilename=D:\.Net Projects\Azteca Express\WebApp\App_Data\AztecaExpress.mdf;Integrated Security=True", DatabaseType.SqlServer2012, SqlClientFactory.Instance);

        }

    }

}