Since you paid a lot of money to license this commercial product, and your code here is directly copied from their web-site [^
], why don't you submit a support ticket ? If you are using a "trial" version, is it possible the trial has expired ?
The most common cause of the kind of error you report would be that you do not have a proper reference set to a necessary dll. In Visual Studio Solutions Explorer open 'References and examine what is there; if necessary select 'Add Reference from its context menu and do the right thing to find the required dll.
Try putting this in the 'using statements:
And see if that compiles.