hiding row combo

There is a datagridview whose datasource is a dataset with table: CREATE TABLE [dbo].[AcceptedCreditCard] ( [AcceptedCreditCardId] [int] IDENTITY (1, 1) NOT NULL , [CreditCardId] [int] NOT NULL , ) ON [PRIMARY] CreditCardId is displayed as a combo box whose datasource is: CREATE TABLE [dbo].[CreditCardMaster] ( [CreditCardId] [int] IDENTITY (1, 1) NOT NULL , [CreditCardName] [varchar] (8) COLLATE Japanese_CI_AS NOT NULL , [SortKey] [int] NOT NULL , ) ON [PRIMARY] The project needed is a way to hide the rows in the combo box which have already been selected once above. It must be done manipulating the DataGridViewComboBoxColumn rows, and not by changing the dataset or making new queries to the database (unless C1 DataObjects is used). Here is an animation showing what it must do: ![][1] ## Deliverables 1) Complete and fully-functional working program(s) in executable form as well as complete source code of all work done. 2) Deliverables must be in ready-to-run condition, as follows (depending on the nature of the deliverables): a) For web sites or other server-side deliverables intended to only ever exist in one place in the Buyer's environment--Deliverables must be installed by the Seller in ready-to-run condition in the Buyer's environment. b) For all others including desktop software or software the buyer intends to distribute: A software installation package that will install the software in ready-to-run condition on the platform(s) specified in this bid request. 3) All deliverables will be considered "work made for hire" under U.S. Copyright law. Buyer will receive exclusive and complete copyrights to all work purchased. (No GPL, GNU, 3rd party components, etc. unless all copyright ramifications are explained AND AGREED TO by the buyer on the site per the coder's Seller Legal Agreement). ## Platform VS 2005, C# (We're using ComponentOne dataobjects, so if you can use it too, then extra calls to DB permissible, otherwise purely C# coding solution required)