Sir,in my pc there is no acrobat reader. there install my program to view pdf. i wrote your program but the error msg came like this " An invalid character was found in text content. Error processing resource 'http://localhost:1891/WebSite1/LoadPdf.aspx'. L... % " please help me... Sanjoy Bagchi S/W Engineer

System.Diagnostics.Process should do what you need with regards to launching exe and passing in parameters. Unless you mean passing input to your own exe. In which case, use the args[] array parameter of the Main method. A quick question for you : In which language do you specialise as a software engineer? "More functions should disregard input values and just return 12. It would make life easier." - comment posted on WTF "I haven't spoken to my wife now for 48 hours. I don't like to interrupt her.