with vb.net + excel 2002

i am transferring data in to an new excel instance

(1) how can i stop users form copy the contents of the work sheet
answer is alm0st uncertain
hence i want to protect the structure of my work sheet (book)

if i protect the work sheet tools -> security ->xx...
then the locked cells are not getting selected for copy purpose, where as how to do the same with vb.net .
i mean an equivalent of VBA