A collection of all the Shape objects that represent placeholders on the specified slide.
Assembly: Microsoft.Office.Interop.PowerPoint (in Microsoft.Office.Interop.PowerPoint.dll)
Each Shape object in the collection represents a placeholder for text, a chart, a table, an organizational chart, or some other type of object. If the slide has a title, the title is the first placeholder in the collection.
You can delete individual placeholders by using the Delete(Int32) method, and you can restore deleted placeholders by using the AddPlaceholder(PpPlaceholderType, Single, Single, Single, Single) method, but you cannot add any more placeholders to a slide than it had when it was created. To change the number of placeholders on a given slide, set the Layout property.