Add Classifieds feature to enable users to add their ads the sale of cars or real estate for example, there is no in ASP.NET any CMS of this type currently is preserve of the PHP unfortunately , nopcommerce Contains a feature Multi-vendor But it's not enough
That is an interesting feature and we will consider adding support for it in the future. We'll let you know when it is reviewed.
I agree that this would be great as a plugin or possibly built into a Share Point system if that is even possible.
The best implementation I've seen so far is OSClass.org which has valuable feature add-ons, though it's PHP based. This (and the functions of it's plugins) would be a good system to base your own off of - if you decide it's a worth-while project.
It is very much needed.
You can also lock at Flynax Classifieds Software, it is PHP based