Found this post here
http://forums.asp.net/t/1144440.aspx
Google returns even more:
http://www.google.co.uk/#hl=en&safe=off&ei=B0T1SpfsEYKH4QbAmbzPAw&sa=X&oi=spell&resnum=0&ct=result&cd=1&ved=0CAYQBSgA&q=.net+decompile+dll+to+source+code&spell=1&fp=4de6aef1efa46664
Regards
Liam
If you've had a problem then someone else has too. Google is your friend. google for your topic title.