How to Launch PDF Reader using C#

http://www.codeproject.com/Articles/37458/PDF-Viewer-Control-Without-Acrobat-Reader-Installe

Hope this might help you.
follow the link.
http://weblogs.asp.net/sreejukg/archive/2011/03/07/create-pdf-document-using-itextsharp-in-asp-net-4-0-and-memorymappedfile.aspx[^]

You didn't specify whether this was for Windows or Web.

For Web, create a URL to the document

For Windows

Process p = new Process();
p.StartInfo.FileName = "myPDF.pdf";
p.Start();

http://msdn.microsoft.com/en-us/library/system.diagnostics.process.aspx[^]

Try:

Process p = new Process();
ProcessStartInfo s = new ProcessStartInfo(@"F:\Temp\MyPDFFile.pdf");
p.StartInfo = s;
p.Start();

Use Process.Start :

Process.Start(@"C:\ThisIsA.pdf");

Use the types Process and ProcessStartInfo setting ProcessStartInfo.UseShellExecute[^] to true. Then if you set ProcessStartInfo.FileName to the PDF (full path) and the ProcessStartInfo.Verb to something like "open". Create a Process and invoke the Start method with th ProcessStartInfo as a parameter.

If the PDF reader is still associated with the extension PDF this will open the PDF reader with said document.

Best Regars,

-MRB