Add Page Number Stamp in a PDF File Out of memory Error

Hi Team,

I am using vb.net code which you have provided on below link and trying to give page number to PDF which has 15000 pages.
But this gives me out of memory error.
please help me to overcome this.
I am using latest aspose.pdf dll.

http://www.aspose.com/docs/display/pdfnet/Add+Page+Number+Stamp+in+a+PDF+File

how can I save the file in incremental mode like after each 1000 page I want to save.