Hi madura,
It's in the Information property. Here's a link.
http://msdn.microsoft.com/en-us/library/microsoft.office.interop.word.selection.information.aspx
I'm not sure how to convert this to C# but this is how it looks in VB
wdoc.Selection.Information(Microsoft.Office.Interop.Word.
WdInformation
.wdActiveEndAdjustedPageNumber)
wdoc.Selection.Information(Microsoft.Office.Interop.Word.
WdInformation.wdActiveEndPageNumber)
wdoc
is my var for the active Word document.
Hope
this helps
Regards