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Inserts some items into the collection at the specified index.
protected override void InsertItems(int index, IEnumerable<DateField> value)Protected Overrides Sub InsertItems(index As Integer, value As IEnumerable(Of DateField))| Type | Name | Description | 
|---|---|---|
| int | index | The zero-based index at which item should be inserted. | 
| IEnumerable<DateField> | value | A IEnumerable<T> containing the objects to add to the collection. | 
| Type | Condition | 
|---|---|
| InvalidOperationException | When add the DateField of the same function to the collection, e.g. the a DateYearField is in the collection, you cannot add either DateEraField or DateEraYearField. |