how to pdf file only view not download in asp.net

http://stackoverflow.com/questions/15634492/how-to-open-pdf-into-pdf-viewer-in-asp-net
http://demo.leadtools.com/JavaScript/DocumentViewer/

System.IO.FileStream fs = new System.IO.FileStream(Path+"\\"+fileName, System.IO.FileMode.Open, System.IO.FileAccess.Read);
byte[] ar = new byte[(int)fs.Length];
fs.Read(ar, 0, (int)fs.Length);
fs.Close();

Response.AddHeader("content-disposition", "attachment;filename=" + AccNo+".pdf");
Response.ContentType = "application/octectstream";
Response.BinaryWrite(ar);
Response.End();