How to open a file from C# ?

This example demonstrates how to open file with an associated program. It shows, 

how to open a file and how to open url address in a default web browser.In c# 

files are opened using Process.Start method .

// open a file

System.Diagnostics.Process.Start(@"c:\letter.pdf");

//Open a URL in default browser

System.Diagnostics.Process.Start("http://snippets4you.blogspot.com");