https://learn.microsoft.com/ja-jp/dotnet/api/system.drawing.printing.printdocument.onendprint?view=netframework-4.8.1&viewFallbackFrom=windowsdesktop-10.0
PrintDocument.OnEndPrint(PrintEventArgs) Method (System.Drawing.Printing) | Microsoft Learn
Raises the EndPrint event. It is called when the last page of the document has printed.
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