Spreadsheet.EntireRange

This property returns/sets a range of all rows/columns.

Syntax Parameters Return Value
- - Range

SVB Example

Filling a spreadsheet with random data: 

Option Base 1
Option Explicit
Sub Main
    Dim spr As New Spreadsheet
    spr.SetSize(10, 15)
    spr.Visible = True
    'set the entire spreadsheet to fill with random values
    spr.EntireRange.FillRandomValues
End Sub