AspPdf...

[Myakire]

En la referencia del componente tiene la solución

Solution

To return the coordinate system to its natural state, a coordinate transformation matrix (CTM) has to be applied to the page canvas, as follows:

Page.Canvas.SetCTM 0, 1, -1, 0, Page.Width, 0
Page.Canvas.DrawText "John Smith", "x=150; y=400", Font

The matrix component [0, 1, -1, 0] performs the rotation by 90 degrees, and [Page.Width, 0] shifts the origin from the upper-left to lower-left corner of the page.

http://support.persits.com/show.asp?code=PS040129123

Saludos