asp.net连接Access的几种方法

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web.config

<?xml version="1.0" encoding="utf-8"?>



<configuration>
  <appSettings>
    <add key="AccessConnString" value="provider=microsoft.jet.oledb.4.0;data source="/>
    <add key="AccessDbPath" value="~/App_Data/guestbook.mdb"/>
  </appSettings>
  <connectionStrings>
    <add name="AccessConnectionString"  connectionString="Provider=Microsoft.Jet.OleDb.4.0;Data Source=" providerName="System.Data.OleDb"/>
    <add name="Access_Path" connectionString="~/App_Data/guestbook.mdb"/>
    <add name="SqlConnectionString" connectionString="Data Source=localhost;Initial Catalog=guestbook;User ID=sa;password=123456;" providerName="System.Data.SqlClient"/>
    <add name="OracleConnectionString" connectionString="Data Source=(DESCRIPTION=(ADDRESS_LIST=(ADDRESS=(PROTOCOL=TCP)(HOST=xp2008)(PORT=1521)))(CONNECT_DATA=(SID=guandb)(SERVER=DEDICATED)));User ID=system;Password=k2763826;Unicode=True" providerName="System.Data.OracleClient"/>
  </connectionStrings>
  <system.web>
        <compilation debug="true" targetFramework="4.0" />
    </system.web>

</configuration>

<?xml version="1.0" encoding="utf-8"?>



<configuration>
  <appSettings>
    <add key="AccessConnString" value="provider=microsoft.jet.oledb.4.0;data source="/>
    <add key="AccessDbPath" value="~/App_Data/guestbook.mdb"/>
  </appSettings>
  <connectionStrings>
    <add name="AccessConnectionString" connectionString="Provider=Microsoft.Jet.Oledb.4.0;data source="/>
    <add name="Access_Path" connectionString="~/App_Data/guestbook.mdb"/>
    <add name="SqlConnectionString" connectionString="Data Source=localhost;Initial Catalog=HuaRunDb;User ID=sa;password=123456;" providerName="System.Data.SqlClient"/>
  </connectionStrings>
  <system.web>
        <compilation debug="true" targetFramework="4.0" />
    </system.web>

</configuration>

后台 aspx.CS

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.Configuration;
using System.Configuration;
using System.Data.OleDb;
using System.Data;

namespace TestOracle
{
    public partial class TestConnect : System.Web.UI.Page
    {
        public static readonly string connStr1 = System.Web.Configuration.WebConfigurationManager.ConnectionStrings["AccessConnectionString"].ConnectionString+ HttpContext.Current.Server.MapPath(WebConfigurationManager.ConnectionStrings["Access_Path"].ConnectionString);
        public static readonly string connStr2 = System.Configuration.ConfigurationManager.AppSettings["AccessConnString"].ToString() + System.Web.HttpContext.Current.Server.MapPath(ConfigurationManager.AppSettings["AccessDbPath"]) + ";";
        public static readonly string connStr3 = "Provider = Microsoft.Jet.OLEDB.4.0 ;Data Source=" + HttpContext.Current.Server.MapPath("~/App_Data/guestbook.mdb");
        protected void Page_Load(object sender, EventArgs e)
        {

        }

        protected void Button1_Click(object sender, EventArgs e)
        {
            OleDbConnection conn = new OleDbConnection(connStr1);
            try
            {
                conn.Open();
                string sql = "select * from GtContent";
                OleDbDataAdapter myadapter = new OleDbDataAdapter(sql, conn);
                DataSet ds = new DataSet();
                myadapter.Fill(ds);

                this.GridView1.DataSource = ds;
                this.GridView1.DataBind();
                this.Label1.Text = "数据库连接成功！";
            }
            catch (Exception ee)
            {
                this.Label1.Text = ee.ToString();
            }

        }
    }
}

connStr1 ,connStr2 ，connStr3

用这三个连接字符串哪个都可以。