asp.net链接MYSQL时出现的问题

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data.SqlClient;
using System.Data;

using MySql.Data.MySqlClient;

public partial class Default2 : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{

}
protected void Button1_Click(object sender, EventArgs e)
{ 
        string ss = "select * from user";
        String strContent = "Server=localhost;User ID=root;Password=root;Database=aspbigword;";
       MySqlConnection con = new MySqlConnection(strContent);
       MySqlCommand cmd = new MySqlCommand(ss, con);
        con.Open();
        DataSet ds = new DataSet();
        MySqlDataAdapter aa = new MySqlDataAdapter(cmd);
        aa.Fill(ds);//查询结果集填充数据集
        MySqlDataReader dr = cmd.ExecuteReader();
     if (dr.Read())
    {
        Response.Write("<script language=JavaScript>alert('登录成功!');location='Default1.aspx'</script>");
    }
    else
    {
        Response.Write("<script language=javascript>alert('登录失败！');location='javascript:history.Go(-1)'</script>");
    }
    dr.Close();
    con.Close();
}




}

运行到con.open()时就出错，是什么问题？ 谢谢

http://blog.csdn.net/u010780613/article/details/48520073