Creating a PHP file from a C# script

I am trying to create a PHP file from a C# Script. The trouble I am having is adding this line to the C# script include("header.php"); This is what I have come up with, but I can only use one set of "" in the line. op.WriteLine( "include("header.php");" ); How would I get the " to print in the PHP file? Is there another way, like an ASCII character that will print as a "?