Quoting the official page http://kcfinder.sunhater.com/
Only PHP server-side scripting is supported. A GD extension is required and safe mode must be turned off. To work with the HTTP cache of the client side, PHP must be installed as an Apache module.
So no. If you need a .net version, you need to either develop one yourself or convince the author to rewrite the backend system so that it supports multiple connectors.
Or, if you feel hardcore, you can try using PHP in the ASP.net pages - but I find that dirty, rude, eww and wtf.
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