A very small help

Question

I have written a program in c# in visual studio 2010 professional , now i want to open a diifernt program like this :
if(e.result.text=="red") if this statement is true so i want 
my windows calculator get open how i can do that do i need to give address of calculator in my program or what will be the syntax ,

please help i will be very thankfull to you.