index The 0-based index at which items should be inserted.
items The IEnumerable<T> of objects to insert. The objects can be null for reference types.
This method internally calls InsertItemRange, which may be overridden.
LeadCollection<T> accepts null as a valid value for reference types and allows duplicate items.
If index is equal to Count, items are added to the end of LeadCollection<T>.
This method raises the CollectionChanged event with Add action.
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