public double PageWidth {get;}

public: __property double get_PageWidth();

public:
property double PageWidth {
   double get();
}

'Declaration
 
Public ReadOnly Property PageWidth As Double

'Usage
 
Dim instance As ImGearPowerPointDocument
Dim value As Double
 
value = instance.PageWidth

Property Value

Page dimensions of the document are stored in the PresentationML package. ImageGear retrieves them (if any) and applies upon loading of the document.

In case of absence of page dimensions within the package, ImageGear by default uses letter size: 8.5"(width) x 11"(height) (1" is equal to 96 pixels).

So, the default page width is 816 pixels.

Reference

ImGearPowerPointDocument Class
ImGearPowerPointDocument Members