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c# - Usage of Server Side Controls in MVC Frame work -

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i using asp.net 4.0 , mvc 2.0 web application. project requiremrnt have use server side control in application not possibl in noraml case. ideally want use adrotator control , datalist control. i saw few samples , references in codepleax mvc controllib howwver found less useful. can tell how utilize theese controls in asp.net application along mvc. note: please provide functionalities related adrotator , datalist controls not equivalent functionalities thanks in advace. mvc pages not use normal .net solution makes use of normal .net components impossible. a normal .net page use event driven solution call different methods service side mvc use actions , view completly different way handle things. also, mvc not use viewstate normal .net controlls require. found article discussing mixing of normal .net , mvc.
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ruby on rails - Nice way of doing dual column validation -

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i'm using rails 3 one. i've got collections model, user model , intermediate subscription model. way user can subscribe multiple collections, particular role. however, don't want user able subscribe same collection twice.

so in subscription model i've got like:

validate :subscription_duplicates  def subscription_duplicates   self.errors.add_to_base "this user subscribed" if subscription.where(:user_id => self.user.id, :collection_id => self.collection.id) end

however seems ugly. also, breaks when want following in collection controller:

def create   @collection = collection.new(params[:collection])   @collection.subscriptions.build(:user => current_user, :role => subscription::roles['owner'])   @collection.save   respond_with(@collection) end

when build subscription not have id "called id nil" error.

thanks guidance!

use validates_uniqueness_of

validates_uniqueness_of :user_id, :scope => :collection_id

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