Powershell Excel Question

i All. I have a script that brings in an excel workbook and exports to CSV. Problem is, i want this to hit multiple workbooks in excel, starting from

$oWorksheet = $oExcelDoc.Worksheets.item(7)

And going to the end

How can i achive this? Code below

$sExcelFile="C:\WindowsPatching_Reference_2016.xlsx"
$sCSVFile="C:\temp\$wksname.csv"
#$SheetName = "WinA-Test_Thu"

# Get COM Object
$oExcel = New-Object -ComObject "Excel.Application"
# Should Excel be visible?
$oExcel.Visible = $true
# and open excel file
$oExcelDoc = $oExcel.Workbooks.Open($sExcelFile)

# Open Worksheet
#$oWorkSheet = $oExcelDoc.sheets.item($SheetName)
$oWorksheet = $oExcelDoc.Worksheets.item(7)
#Get Sheet Name
$Name = $oworksheet.name
# Activate, show it
$oWorksheet.Activate()

$oExcelDoc.SaveAs($sCSVFile,[Microsoft.Office.Interop.Excel.XlFileFormat]::xlCSVWindows)

$oExcelDoc.Close($false)
Start-Sleep 1
# Cleanup COM
[System.Runtime.InteropServices.Marshal]::ReleaseComObject($oWorksheet)|out-null
$oWorksheet=$null
Start-Sleep 1
# Cleanup COM
[System.Runtime.InteropServices.Marshal]::ReleaseComObject($oExcelDoc)|out-null
$oExcelDoc=$null
# Close Excel
$oExcel.Quit()
Start-Sleep 1
# Cleanup COM
[System.Runtime.InteropServices.Marshal]::ReleaseComObject($oExcel)|out-null
$oExcel=$null
[GC]::Collect()
[GC]::WaitForPendingFinalizers()

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