'Declaration Public Property Icon As System.String
public System.string Icon {get; set;}
The PDF specification provides a predefined set of icons, those are provided by the StampAnnotationIcon enumeration.
In practice though this entry often contains names of custom icons specific to the application that created the document, hence this property is a string so it can accommodate arbitrary values.
To assign a predefined icon, use code like the following:Icon = StampAnnotationIcon.Approved.ToString();
'Declaration Public Property Icon As System.String
public System.string Icon {get; set;}