输出PDF文档到ASP.NET页面

项目中的WORD报表文档最终会被转换为PDF文档，输出到WEB页面中，下面的代码是读取PDF文件并写入到页面输出流中：

protected void Page_Load(object sender, EventArgs e)
    {
        try
        {
            //query the pdf path
            string pdfna = this.Request.QueryString["pdf"];
            if (pdfna == null)
                throw new Exception("This page can not be accessed directly");
            string pdf = "Reports\\" + pdfna;
            pdf = Server.MapPath(pdf);

            //read all bytes
            if (File.Exists(pdf) == false)
                throw new Exception("This report is not created");
            FileStream fs = File.Open(pdf, FileMode.Open);
            byte[] buffer = new byte[fs.Length];
            fs.Read(buffer, 0, buffer.Length);
            fs.Close();

            //write to response
            Response.ContentType = "application/pdf";
            Response.AddHeader("content-disposition", "filename=" + pdfna);
            Response.AddHeader("content-length", buffer.Length.ToString());
            Response.BinaryWrite(buffer);
        }
        catch (Exception ex)
        {
            Response.Write(ex.Message);
        }
        finally
        {
            Response.Flush();
            Response.Close();
            Response.End();
        }
    }