跪求中，用SQL语句查询SQL server数据库tb_files表里的信息，然后把查到的信息显示在GridView控件

        string sql = "select * from teacher where Teaid LIKE '% " + TextBox1.Text + " %'";
        SqlConnection con = new SqlConnection();
        con.ConnectionString = ConfigurationManager.ConnectionStrings["teacher"].ConnectionString;
        SqlCommand cmd = new SqlCommand(sql, con);
        SqlDataAdapter dp = new SqlDataAdapter();
        DataSet ds = new DataSet();
        dp.Fill(ds);
        GridView2.DataSource = ds.Tables[0];