Transparency Property

public double Transparency {get; set;}

'Declaration
 
Public Property Transparency As Double

'Usage
 
Dim instance As PDFAnnotation
Dim value As Double
 
instance.Transparency = value
 
value = instance.Transparency

public double Transparency {get; set;}

 get_Transparency();
 set_Transparency(value);  

public:
property double Transparency {
   double get();
   void set (    double value);
}

Property Value

A value of 0 means that the annotation is fully transparent, 1 means that the annotation is fully opaque

For an example, refer to PDFAnnotation

Target Platforms: Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

Reference

PDFAnnotation Class
PDFAnnotation Members