Write to bound CheckBoxList.Selected Value

I'm using VS2008 with .NET 3.5 SP1 to create a Web App.

I have a CheckBoxList in a Wizard step that is bound to a LINQ Datasource that returns a list of email addresses from a table called EmailAddresses.

This all works fine and the data is displayed as required when the step is loaded.  Next I need to query a table called EmailRecipients. This holds a list of EmailAddresses that have been previously selected from the Email Addresses table. I need to query the Email recipients table and check the boxes where the email address matches an address in the CheckBoxList.

The EmailAddresses table holds a list of all available addresses, the EmailRecipients table holds a list of Addresses that have been previously picked from the EmailAddresses table in a previous wizard step. So the EmailRecipients table will never hold an address that isn't in the EmailAddresses table.

So to summarize, I want to keep the CheckBoxList bound to the EmailAddresses LINQ datasource, query the EmailRecipients Table in code behind, and check the boxes of the returned addresses.

Hope this makes sense.