输出PDF文档到ASP.NET页面

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(