Exporting data from Gridview to Word Document in C#

protected void btnExportWord_Click(object sender, EventArgs e)

{

    Response.Clear();

    Response.Buffer = true;

    Response.AddHeader("content-disposition",      
                        "attachment;filename=SearchInfo.doc");

    Response.Charset = "";

    Response.ContentType = "application/vnd.ms-word ";

    StringWriter sw= new StringWriter();

    HtmlTextWriter hw = new HtmlTextWriter(sw);

    dgSearch.AllowPaging = false;

    dgSearch.DataBind();

    dgSearch.RenderControl(hw);

    Response.Output.Write(sw.ToString());

    Response.Flush();

    Response.End();

}