I suggest you to browse the resource library for LabWindows on:
http://zone.ni.com/devzone/devzone.nsf/webproducts/a77c886190b47fd286256785006d6ca9?opendocument
Inside it you will find some useful articles with both sample code and discussion of some techniques for programming. It's subdivided in categories so you're helped in search what you want faster.
Roberto