Web中显示pdf文件

if (Page.IsPostBack)...{ 
FileStream MyFileStream = new FileStream(@"d:inetpubwwwrootsmall.pdf", FileMode.Open); 
long FileSize; 
FileSize = MyFileStream.Length; 
byte[] Buffer = new byte[(int)FileSize]; 
MyFileStream.Read(Buffer, 0, (int)MyFileStream.Length); 
MyFileStream.Close(); 
Response.ContentType="application/pdf"; 
Response.AddHeader( "content-disposition","attachment; filename=MyPDF.PDF"); 
Response.BinaryWrite(Buffer);