asp.net遇到问题 小白求帮助

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;

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

}
protected void Button1_Click(object sender, EventArgs e)
{
    string mystr;
    SqlConnection myconn = new SqlConnection();
    mystr = "Data Source = localhost;Initial Catalog = eat;" + "Integrated Security = False; User Id = sa; Password = mgx";
    myconn.ConnectionString = mystr;
    try
    {
        myconn.Open();
        SqlCommand mycmd = new SqlCommand("select 密码 from eat where 账号 = @账号", myconn);
        mycmd.Parameters.Add("@账号",SqlDbType.VarChar).Value = TextBoxlogin1.Text.Trim();
        SqlDataReader dr = mycmd.ExecuteReader();
       /*if (dr[0].ToString() == TextBoxlogin2.Text.ToString())
        {
            Button1.Text = "成功";
        }
        else
            Button1.Text = "失败";*/
        //dr.Close();
    }
    catch
    { 

    }
    finally
    {
        myconn.Close();
    }
}

}

sql错误，检查下表名
以及密码是不是nvarchar类型还是int类型

在 System.Data.SqlClient.SqlException 中第一次偶然出现的“System.Data.dll”类型的异常