Pdf is not been downloaded in correct format in mobile devices in c#?

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C#

ASP.NET

PDF

Hi,
I have created a pdf file using pdf Sharp in my project. The created pdf is been downloaded also by the clients. It works fine in desktop browsers, but it doesn't be in correct format in some mobile device browsers. For example: iphone,ipad,android, windows phone etc.

I have tried this code

public void download2(string fpath)
        {

            // string fileName = "detailed_syllabus.pdf";
            Response.ClearContent();


            FileInfo updateFile = new FileInfo(fpath);
            Response.ContentType = "application/octet-stream";
            Response.AddHeader("content-disposition", "attachment;filename=\"" + Path.GetFileName(updateFile.FullName) + "\"");
            Response.AddHeader("content-length", updateFile.Length.ToString());
            Response.TransmitFile(updateFile.FullName);
            Response.Flush();
            
        }