Ensures the DataSource is valid and contains at least one valid DataRelation.
A valid DataRelation.
A DataRelation is required to link the child list's items to the selections in the parent list.
| Exception Type | Condition |
|---|---|
| InvalidOperationException | The datasource is not a DataSet or does not contain at least one valid DataRelation. |
RelationalListBox Class | Fusion8Design.WebControls.UI Namespace