Imports System.Diagnostics
Imports System.IO
Imports Bytescout.Spreadsheet

Class Program
    Friend Shared Sub Main(args As String())
        ' Open spreadsheet from file
        Dim document As New Spreadsheet()
        document.LoadFromFile("example.xls")

        ' Get first worksheet
        Dim worksheet As Worksheet = document.Workbook.Worksheets(0)

        'Hide first three columns
        worksheet.Columns(0).Hidden = True
        worksheet.Columns(1).Hidden = True
        worksheet.Columns(2).Hidden = True

        'Hide first three rows
        worksheet.Rows(0).Hidden = True
        worksheet.Rows(1).Hidden = True
        worksheet.Rows(2).Hidden = True


        ' Delete output file if exists
        If File.Exists("changed.xls") Then
            File.Delete("changed.xls")
        End If

        ' Save document
        document.SaveAs("changed.xls")

        ' Close spreadsheet
        document.Close()

        ' Open generated XLS document in default program
        Process.Start("changed.xls")
    End Sub
End Class