Insert EO grid view data into the database

using System;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
using System.Data.SqlClient;
using System.Data.Sql;
using System.Data;
using EO.Web;
using EO.Web.Internal;

public partial class _Default : System.Web.UI.Page
{
public static string connectionString = @"Data Source=.\SQLEXPRESS;AttachDbFilename=Data Source=.\SQLEXPRESS;AttachDbFilename=C:\Documents and Settings\mshamanna\My Documents\Visual Studio 2010\WebSites\EOTest2\App_Data\Database.mdf;Integrated Security=True;User Instance=True";

protected void Page_Load(object sender, System.EventArgs e)
{

string sql = @"select * from Temp";
SqlConnection conn = new SqlConnection(connectionString);
SqlDataAdapter da = new SqlDataAdapter();
SqlCommand cmd = new SqlCommand(sql, conn);
da.SelectCommand = cmd;
DataSet ds = new DataSet();
da.Fill(ds, "Temp");

Grid1.DataSource = ds.Tables[0];
Grid1.DataBind();

}

//To Save grid values into database
protected void btnSave_Click(object sender, System.EventArgs e)
{
string header3 = "";
int id = 0;

SqlConnection conn = new SqlConnection(connectionString);
conn.Open();
int count = 0;

foreach (EO.Web.GridItem item in Grid 1.Items)
{
count++;
//Get the cell value in the second column
header3 = (string)item.Cells[2].Value;

string sql = @"UPDATE TEMP SET HEADER3='" + header3 + "' WHERE ID='" + count + "'";

SqlCommand cmd = new SqlCommand(sql, conn);

cmd.ExecuteNonQuery();

}

conn.Close()


}