To instantiate instances of NSHTTPCookie you need to pass an NSDictionary to either the NSHttpCookie constructor or the NSHttpCookie.CookieFromProperties method.

The actual keys have to be one the public Key static fields from this class (NSHttpCookie.KeyName, NSHttpCookie.KeyValue, NSHttpCookie.KeyOriginURL, NSHttpCookie.KeyVersion, NSHttpCookie.KeyDomain, NSHttpCookie.KeyPath, NSHttpCookie.KeySecure, NSHttpCookie.KeyExpires, NSHttpCookie.KeyComment, NSHttpCookie.KeyCommentURL, NSHttpCookie.KeyDiscard, NSHttpCookie.KeyMaximumAge and NSHttpCookie.KeyPort).

	  var properties = NSDictionary.FromObjectsAndKeys (new object [] { "MyCookieValue" }, new object [] { NSHttpCookie.KeyValue });
	  var cookie = new NSHttpCookie (properties);