Hello, As a general information; C Sharp(C#) is one of the most popular programming language developed by Microsoft. Yes, C Sharp is a trademark but it's not a product to sell, it's a free programming language and people can resell their application based on c# written code, so this doesn't affect to use and/or resell this domain name for my opinion. This info domain name is 11 years old, several extensions are already registered. Net and biz extensions belong to Microsoft, owner of the org extension is BuyDomains and their minimum price for it 3,4k $(Seen on GoDaddy Auctions). I'll be glad to hear your comments about this domain name including the trademark status, developing ideas and price value. Thanks.