## Add(*[CustomXmlPart](../../customxmlpart/)*) {#add_1} Adds an item to the collection. ```csharp public void Add(CustomXmlPart part) ``` | Parameter | Type | Description | | --- | --- | --- | | p......markup/) * assembly [Aspose.Words](../../.. ---.../..aspose.words.markup/) * assembly [Aspose.Words](../../.....