Grid View with Fixed Header

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

public partial class _Default : System.Web.UI.Page 
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (GridView1.Rows.Count > 0)
        {
            ClientScript.RegisterStartupScript(this.GetType(), "CreateGridHeader", "<script>CreateGridHeader('DataDiv', 'GridView1', 'HeaderDiv');</script>");
        }
    }

    protected void cmdClick_Click(object sender, EventArgs e)
    {
        string conString = "Provider=Microsoft.JET.OLEDB.4.0; data source=" + Server.MapPath (string.Empty)  + @"\Database\Northwind.mdb";
        string sqlString = "SELECT * FROM CUSTOMERS";
        OleDbConnection conn = new OleDbConnection(conString);
        DataSet ds = new DataSet();
        OleDbDataAdapter adapter = new OleDbDataAdapter(sqlString, conn);
        adapter.Fill(ds);
        GridView1.DataSource = ds.Tables[0];
        GridView1.DataBind();
        ClientScript.RegisterStartupScript(this.GetType(), "CreateGridHeader", "<script>CreateGridHeader('DataDiv', 'GridView1', 'HeaderDiv');</script>");
    }
}