Gets page width for current section.
This method doesn't have any parameters.
builder.CreateFile("docx");
var oDocument = Api.GetDocument();
var oParagraph = oDocument.GetElement(0);
var oSection = oDocument.GetFinalSection();
var nWidth = oSection.GetPageWidth();
oParagraph.AddText("Page width = " + nWidth);
builder.SaveFile("docx", "GetPageWidth.docx");
builder.CloseFile();