Adds an array of text values to the end of the existing selection list values.
null, an empty string, or a string longer than 255 characters. Text values will preserve whitespace when stored and are case-sensitive during comparison. Duplicate text values will only be added once. The order of the values will be preserved.  A text value can only occur once in the selection list. String values are case sensitive and whitespace sensitive. The added values will not be stored permanently until Store is called. 
| Exception Type | Condition | 
|---|---|
| InvalidOperationException | The selection list has already been removed. | 
| ArgumentException | The values contain an empty string or a string longer than 255 characters. | 
ISelectionList Interface | Plumtree.Remote.PRC.Content.SelectionList Namespace