How to get the size (width and height) of the area with excel vsto c# excluding the ribbon area?

Question

How to get the size (width and height) of the area with excel vsto c#, excluding the ribbon area? This is the area shown with red marker below:

Answer 1

This code should work,

Dim ws As Excel.Worksheet = Globals.ThisAddIn.Application.ActiveSheet
Dim _with1 = ws.PageSetup

sngWidth = _with1.Application.Width
sngHeight = _with1.Application.Height