Exporting Gridview Data to MS word 2007 and MS Excel 2007

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C#3.0

C#

hi....
how to export the gridview data to msword and msexcel ...i have done it but its not supporting XML data....since i am having MSword 2007 and MS excel 2007
and this is my coding:-

public partial class _Default : System.Web.UI.Page 
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            binddate();
        }

    }
    private void binddate()
    {
        try
        {
            string connection = ConfigurationManager.AppSettings["ConnectInfo"];
            SqlConnection con = new SqlConnection(connection);
            SqlDataAdapter da = new SqlDataAdapter("select * from quanta", con);
            DataTable dt = new DataTable();
            da.Fill(dt);
            gv_details.DataSource = dt;
            gv_details.DataBind();

        }
        catch (Exception ex)
        {
            Response.Write(ex.Message);

        }
    }
    public override void VerifyRenderingInServerForm(Control control)
    {
        /* verifies the control is rendered*/

    }

    protected void btn_word_Click(object sender, ImageClickEventArgs e)
    {
        gv_details.AllowPaging = false;
        gv_details.DataBind();
        Response.ClearContent();
        Response.AddHeader("content-disposition", string.Format("attachment;filename={0}", "Doc1.docx"));
            Response.Charset="";
        Response.ContentType="application/ms-word 2007";
        StringWriter sw = new StringWriter();
        HtmlTextWriter htw=new HtmlTextWriter(sw);
        gv_details.RenderControl(htw);
        Response.Write(sw.ToString());
        Response.End();
    }
}

please help me....thanks in advance...