I try to use Items from RadComboBox as input for a ControlParameter in a ObjectDataSource (or SqlDataSource). But I get an error:
Type 'Telerik.Web.UI.RadComboBoxItemCollection' in Assembly 'Telerik.Web.UI, Version=2008.1.619.35, Culture=neutral, PublicKeyToken=121fae78165ba3d4' is not marked as serializable.
Why I do that? I have expanded the ComboBox in a ItemTemplate with checkboxes and I need to find out which boxes are checked. Normally I loop over the collection and check the checkboxes.
But where to do that when the ComboBox is bound to a ObjectDataSource or SqlDataSource?
Overriding the control and add a new property? Is there any event to use?
Telerik: Is it possible to make Items serializable?
Thanks for any suggestions