gridview的问题～

using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Data.SqlClient;

public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
Bind();
}
}
public void Bind()
{
//创建连接
SqlConnection con = new SqlConnection("server=.;uid=sa;password=sa;database=pubs");
SqlDataAdapter da = new SqlDataAdapter("select * from jobs", con);
//数据集
DataSet ds = new DataSet();
da.Fill(ds, "jobs");
this.GridView1.DataSource = ds.Tables[0];
this.GridView1.DataB