数据库数据 在datagrideview 显示；

using System;
using System.Data;
using System.Text;
using System.Windows.Forms;
using System.Data.SqlClient;
namespace Test07
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        SqlConnection conn;
        private void button1_Click(object sender, EventArgs e)
        {
            conn = new SqlConnection("server=192.168.1.145;database=lydb;uid=sa;pwd=123@abc");
            SqlCommand cmd = new SqlCommand("select * from student", conn);
            SqlDataAdapter sda = new SqlDataAdapter();
            sda.SelectCommand = cmd;
            DataSet ds = new DataSet();
            sda.Fill(ds, "cs");
            dataGridView1.DataSource = ds.Tables[0];
        }
    }
}