Creates a new page of size PaperWidth x PaperHeight (in Adobe PDF points).
1 Adode PDF point = 1/72 of an inch, so a page of 595 x 842, equates to 8.26 x 11.69 inches, i.e. A4.
Alternatively, you can set a specific page size and layout.
If InsertIndex > -1, the new page will be inserted at the specified page index of the document. If -1, it will be appended to the end of the document.
Result will be the index of the new page (which will be the same as CurrentPageIndex
// Add a new page of 595 x 842 (each point is 1/72 of inch, so you are creating a page of 8.26 x 11.69 inches, which is an A4 page) pdf.AddPage( 595, 842 );