Export gridview contents to PDF with c#

Hi Experts,

just trying to achieve the above with these codes

but i get a message saying "Adobe Reader could not open the file because it is either not a supported file type or the file has been damaged"

Do I need an extract component installed on my machine?

thanks

public static void ExportPDF(string fileName, GridView gv)
    {
        HttpContext.Current.Response.Clear();
        HttpContext.Current.Response.AddHeader("content-disposition", string.Format("attachment; filename={0}", fileName));
        HttpContext.Current.Response.ContentType = "application/pdf;";

        using (StringWriter sw = new StringWriter())
        {
            using (HtmlTextWriter htw = new HtmlTextWriter(sw))
            {
                //  Create a form to contain the grid
                Table table = new Table();
                //  include the gridline settings

                table.GridLines = gv.GridLines;
                //  add the header row to the table
                if (gv.HeaderRow != null)
                {
                    GridViewExportUtil.PrepareControlForExport(gv.HeaderRow);
                    table.Rows.Add(gv.HeaderRow);
                }

                //  add each of the data rows to the table
                foreach (GridViewRow row in gv.Rows)
                {
                    GridViewExportUtil.PrepareControlForExport(row);
                    table.Rows.Add(row);
                }

                //  add the footer row to the table
                if (gv.FooterRow != null)
                {
                    GridViewExportUtil.PrepareControlForExport(gv.FooterRow);
                    table.Rows.Add(gv.FooterRow);
                }

                //  render the table into the htmlwriter
                table.RenderControl(htw);

                //  render the htmlwriter into the response
                HttpContext.Current.Response.Write(sw.ToString());
                HttpContext.Current.Response.End();
            }
        }
    }
    #endregion


========================================================= 

protected void Button1_Click(object sender, EventArgs e)
    {
        if (this.rdoStudentListExportOptions.SelectedIndex == 1)
        {
            //  the user wants all rows exported, turn off paging
            //  and rebing the grid before sending it to the export  utility
            this.gvAcademy.AllowPaging = false;
            this.gvAcademy.DataBind();
        }
        else if (this.rdoStudentListExportOptions.SelectedIndex == 2)
        {
            //  the user wants just the first 2000,
            //  adjust the PageSize and rebind
            this.gvAcademy.PageSize = 2000;
            this.gvAcademy.DataBind();
        }
        //  pass the grid that for exporting ...
        GridViewExportUtil.ExportPDF("HE_STUDENTS.pdf", this.gvAcademy);
    }

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